« on: July 22, 2014, 09:19:15 PM »
I bought the non-IS about a year ago, after the Sigma (100-300 f4) that I was using lost autofocus and repair parts were unavailable. Of course I would have gotten the IS2 if I could afford it, but I could not and the non-IS was a thousand bucks less. Very happy with the lens, no complaints, and the high ISO on the 5D3 is so good that I can just bump up ISO in place of using IS. (I also use a tripod often, which of course negates the need for IS).
I find it tack sharp and it is interesting to see people here say it is actually sharper than the IS version 1. Makes me glad I got the non-IS new instead of getting an IS1 used. But of course if money is not an issue than by all means you should get the IS2. For me the main advantage of the IS2 would not be the IS, but rather the closer minimum focusing distance.