"I mainly use this lens for close-up work like insects and plants. It is ideal for a full frame high resolution sensor and is sharp from edge to edge. I can't find any faults at this stage." bhphotovideo.com
"It is fantastically sharp, fast to focus on my 350D, light and easy to hand hold. It is nicely balanced even with the 2X converter in place." bhphotovideo.com