I think some of the people who buy the 2.8 version are more to show off to others that they have got the more expensive version and not that they really need the faster lens. To me, the picture quality of the f4 version is probably at least 95% of that of the 2.8 version. So does it really justify carrying almost double the weight for that 1/2 stop gain?
Well, I guess it's ultimately boils down to how thick one's wallet is. ;p
Well, I guess it's ultimately boils down to how thick one's wallet is. ;p