Just to get opinions from all phototaking lovers...

I wish to change my EOS 550D for a more compact and lighter camera. However I still want to take wonderful photos as how 550D does. My friend recommended me Panasonic Lumix and I am eyeing on GF6 at the moment.

I never try Panasonic before so not sure about their performance level. My only concern is to shoot fast moving objects (my son... ) and night portrait..

I never upgrade to any lenses kits for my EOS. Right after bought the camera and being as a parent myself. That is why I need a lighter body. 660D is too bulky for me.

Other suggestions are:-
1. Olympus E-PL5
2. Sony Alpha NEX 3
3. As stated above, Panasonic Lumix GF-6
4. No, keep EOS 550D

Great thanks.

Just keep it. Last time I let go my Nikon D80 and downgrade to Canon G10. After a while regret coz DSLR quality is the best

That's different. Because the Canon G10 has a small compact sensor. Nowadays small cameras are having bigger sensors that are matching APSC DSLRs, including image quality performance.

As for recommendation, yes change your 550d for a mirrorless camera as the small size encourages you to bring the camera out more!

Choosing which one is the hard part I'd recommend you go check the cameras out and see which one you prefer in your hand and the menu layouts. They all quite good. But Panasonic GM1 looks very appealing for being the smallest mirrorless and a compact zoom lens.

If you still prefer Canon you can take a look at the Canon G1x Mark 2. Yes its quite pricey, can't change lens, but probably has everything you need with a big sensor to get DSLR quality photos.

If you're looking for small bodied quick AF with burst, try take a look at Sony A6000.. Blazing fast...

IMHO..... best parents camera --> RX100 or the MKII flavor.

If I'm in your shoe, I will keep the 550D for more serious photoshoot and buy another mirrorless for more casual use if the budget allowed.

You;ve stated the who you photograph, now time to state with what:
1. External lighting? Most mirrorless except Sony Nex high end does not really work with speedlights
2. Where - mirrorless are great outdoors
3. Focal lengths and aperture. It cost a bit more for fast lenses in mirrorless...if you have invested in Canon glass its even more tough to switch away.
4. Except the mid to high end bodies with good lenses and phase detection, don't expect continuous focus to work. No problem if your kid is old enough to pose but mine don't.

I have Nex 3 with kit lens and 60D with a few lenses and speedlights.
I use the Nex 3 only during holiday trips when I don't drive, which is like once in a year...lol