If you don't mind 3rd-party lens with TTL-capability, can go for the new Nissin i40.
Bought mine in SG for S$223 when it was launched earlier this month.

Can google for the review of this flash in the net.

So far so good.
Works like a charm on easy indoor shoot like birthday party.
It's quite worth it as the package comes with flash diffuser, so no need to spend on Stofen, etc.
As the other flash unit that I have is the small stock flash that comes together with XT-1, hard for me to say as I don't have Fuji's other TTL-flash like the EF-42, EF-X20, etc. to compare against the Nissin.

It's the other way around.
The Hoya HD that I had was more difficult to clean compared to B+W.
All my XF and Touit lenses have XS-Pro Nano UV filters fitted since day 1.

Good quality UV filter such as B+W XS-Pro Nano, Hoya HD, Marumi DHC, etc, depending on your budget.

Good choice
That's the UV filters I'm using on my 12, 32 and 56

I have 3 original batteries, just to be on the safe side.
1 bought extra from the retailer when I bought the X-T1 and another from Amazon US when it was selling for around US$40

I've tested the 16-55 2.8, paired with XT-1 body and the lens is huge and heavy, with 77mm filter size to boot.
I don't know where you get the idea that it is the same size as 18-55.
After testing the lens at Fujifilm SG, I decided against getting it due to these reasons:
Price, weight, size, no IS, filter size, lens extend when zooming (unlike the 50-140 2.8).

As I already have Zeiss 12, 32 and XF56, I think I'd wait for the new 16 1.4 or 23.
To me, the 50-140 is much better value ompared to the 16-55

No need to test the lens, if you see the photos and read the specs online, you will know that the lens is a giant, compared to the current Fuji lenses, except the 50-140 which is the largest and heaviest.

I bought the Touit 12 and 32 online from B&H when Zeiss USA was having the promotion for US$1k for both lenses.
I even sold my few months old 10-24 after I bought the Touit.
As for sample comparison photos, there are some at the regular websites that our members here have recommended.

Instead of why I prefer the Touit, lets just say I sold the 10-24 because of no aperture ring on the barrel (even though it is constant f4, so dunno what the Fuji designer is thinking), slower aperture (4 vs 2.8), size and filter size (72mm), weight and price.
The Zeiss offer @US$1k for the 12 and 32 was too hard to resist.
If there was no offer, I would have stick to 10-24

Definitely the Olympus 12-40 and Pan 12-35 are so much smaller, as I used to own both these lenses.
Their filter sizes are only 62 and 58mm respectively, and their barrel diameters also not that much bigger.
Definitely can't beat the law of physics as the m4/3 format can take advantage of the small glass

XF is supposed to be their premium lens, with XC being the budget lens.
But so far they only have 2 XC lenses.
My XC50-230 lens comes with plastic mount, whereas I believed XF lenses have metal mount.
XC lenses are also Made in China, while some XF lenses are Made in Japan, and some MIC.

However, of all the XF lenses, only the 16-50 f2.8 and 50-140 f2.8 have the red badge on it

Same here, but in different colour

The Hadley Small can fit X-T1 with mounted 56, and 2 other prime lenses + iPad Mini, or 1 lens + Nissin i40 flash + iPad Mini

Having owned a Hadley Pro before and currently own the Small, normally you choose either of these two if you remain "mirrorless" user

The Hadley Pro can also acts as everyday messenger bag if you remove the padding inside.
Brad Pitt was photographed carrying one on his shoulder few years ago.

The Pro can fit in a MBP 13" comfortably, but will be bulging a lot if you also carry your X-TI and lenses together with your MBP.
The Small can fit the iPad mini nicely, with your X-T1 and 2-3 small lenses.

Bear in mind that the Billingham Hadley series are on the slimmer side, so if you need a deeper bag, can go for their other series, like F-stop, which are much heavier even when empty

For such an expensive lens, at least go for B+W XS-Pro MRC-Nano, Hoya HD or Zeiss T*
From my experienced, the MRC-Nano is easier to clean than the Hoya HD, but not sure about the latest HD2

If you will be using the zoom indoor, get the 55-200 (or better still, the 50-140 ).
I have the 50-230 with X-T1, and shooting indoor, eg. inside a hall for children choir, etc can be a PITA.
Need to bump up the ISO to the max. OIS can't really help much

To all Zeiss Touit users out there.
New firmware for Touit 12 2.8 and 32 1.8

Zeiss Touit firmware page

You're welcome bro.

I haven't updated my X-T1 to v3.1, so my Touit 12 and 32 have to wait

Can also PM MrOss as I saw on his FB page that he also sell Samyang 12 f2

Singapore's retail price will be S$1599, with pre-order promo from 15 to end April.
Hopefully Malaysian retail price will be lower as Fuji's products tend to be lower, pre GST

Used to own the 27, and it is a good lens.
Small and compact, with sharp optic wide open, but the no aperture ring on the lens barrel can be a bummer, unless you just migrated to Fuji and have no problem to dive into the menu to change the aperture.