"This is the lens i have wanted for a few years, I had purchased the NON IS lens 5 years ago and had somne decent results with it, but using the IS Lens is a shear joy." bhphotovideo.com
"I use this for taking photos of the kids, and it is fantastic. super sharp, and not as bulky as the 2.8. I would highly recommend this lens." bhphotovideo.com
"WOW! It is SHARP and contrasty and focuses fast on my 1Ds2. Very lightweight for a 400f4 and the IS seems to work exceptionally well." bhphotovideo.com