Yes very slow, even on D300 its crawling

I'm looking for 2 fast prime lenses to replace my zoom lens. I'm looking at 85mm and 28/35mm. For the 85mm I have decided on the Nikon 85mm f/1.8g.

However, for the wide angle lens I need recommendations. Currently it's either the 28mm f/1.8g or the 35mm f/1.8g FX. Based on reviews, the 35mm f/1.8g FX is quite underwhelming. I tried it and found that the vignetting at f/1.8 is pretty bad too. I have not tried the 28mm though. Any of you guys have personal experience with these lenses? If either is not recommended, what would you recommend?

FYI I mostly shoot at 20-35mm.

When in high shutter speed like 1/500 or faster or when locked on a tripod. You may want to use VR even on a monopod. But I believe the newer generation knows how to detect when on a solid tripod because at times I forget to off mine and still did not notice any difference in the pics between VR off or VR on.

In sports, VR takes a few miliseconds to start up and stabilise before a shot can be taken. Most people switch it off as it can interfere with focusing speed. VR helps when you're doing panning and automatically detects if you're doing horizontal or vertical panning.
Me ! 

Speaking about VR and AF-On, it used to be that the VR motor is not activated when you focus with AF-On. I know this on the D300 and the D700. It is only activated when you half press the shutter button.

But on newer bodies like the D800, the VR motor is already activated when press the AF-On button. That's one of the new things implemented.

With regards to "slow" focus when using VR lens with VR on, the trick to make the VR motor always activated and ready to focus is to preempt the shot and keep pressing the AF-On button or half press the Shutter button a few times before taking the shot.
Me ! 

ok guys.. need recommendation on UWA..
preferably around rm2k

dont mind buying 2nd hand or new

few lens come to my mind:
new nikon 18-35 f3.5-4.5 afs
tokina 16-28 f2.8
tokina 17-35 f3.5-4.5

nikon 16-35 is out of budget
also old nikon 18-35 afd not quite a match for my d600 (tested)

Actually can just visit the BTS showroom and try any lens you want 

I randomly asked any Nikon staff nearby and they will just take the lens and let me try on my camera. Did you ask?

yeah planning to get either one of them soon. LR= lightroom is it?

my stars come from hardware Q&A section, not photography section and it is long long time ago la
you use 50mm yesterday the bokeh so nice

Which lens? 
Lolz. Can consider other UWA lenses also geh. 

use tripod, lower your ISO and set the F number higher (smaller aperture)