Originally posted by Pentaxor how bout shooting in lowlight indoors or dark sceneries at dusk or dawn? would that be a problem?
Indoors in low light is not the first application one normally thinks of for an ultra-wide lens. Dusk landscapes, maybe, but a) you don't need a very fast shutter speed to get a good shot at 14mm, and b) unless you really want to try for shallow DOF in your landscape shots, I think most would still prefer to stop down and raise ISO or use a tripod.
Not to say there wouldn't be a reason to ever shoot at f/2.8, just that ultra-wide lenses make that less likely than other lenses. In general, with ultra-wide angle, if you're going to capability is considered more worth paying the price for in size, so a lot of people looking at the 14 end up choosing the 12-24 instead.