Drizzt321 said:
It's to get the shutter speed up as high as possible. Most especially if you're in an area that doesn't allow flashes, although not sure how often you'd use a super-wide or wide angle in those areas, which are usually churches, since you'd be getting kinda in the way for most ceremonies.
Exactly - you named one reason for my doubting f2.8 on a uwa is all important. The second is shutter speed - if 1/x second is ok @70mm and f2.8 for handheld & motion, then surely 1/(x/2) is ok @17mm and f4?
Of course "as fast as possible" is desirable, but I'm wondering if for a wedding/event setup a top f2.8 uwa zoom is the right spot to spend money for in contrast to your "bread and butter" 24-70 & maybe 70-200 f2.8 zooms.