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I'd like to buy D5100, but its small grip really annoys me. Is there any custom grip from 3rd party? I found only custom grips for compact and CSC cameras. And I don't want to buy a battery grip...

http://sortable.com/cameras/Fastest-shutter-lag-cameras-84783

K-5 - 104ms
K-30 - 162ms

The question is how accurate the numbers are (e.g. D4 208ms???)

It is not the same. The applet at the Conclusion section doesn't work properly. At least on my computer in Chrome browser. Switch on the comparison applet and try to add some other cameras and move...

You won't find it because A65 and A57 are crippled. AutoISO upper limit is fixed to 1600, respectively to 3200. Only A77 allows you to set lower and upper AutoISO limits. Hopefully this will be...

1) in case of PDAF Canon handles with heavier lens elements very well. So I think the weight of moving elements are not an issue.
2) you are right about hybrid AF area
3) CDAF in Panasonic doesn't...