Hi Tom
I've printed out a couple 13X17 and they are very sharp. The lens on it amazes me more all the time. The RAW write speed and the Low light AF are slow...but it works great with JPG straight from camera...man it's nice sometimes to not fool around in PS. Also found a trick when shooting low light Hi ISO, I set sharpness and contrast to -5 and bring it up in PS with contrast sharpening(large radius - low USM level)...and then sometimes a mild edge sharpening action I found somewhere. It does eliminate a little detail but also much noise...makes 400ISO useable.
Barri