Canon EF 100mm F2.8 L IS USM review from DPReview.

Canon 100mm F2.8 L IS USM Macro Lens Review: 6. Conclusion & samples: Digital Photography Review

There's little doubt that, all round, this is one of the very finest lenses we've seen - optically it's superb, and operationally it works very well too, with fast and positive autofocus, and one of the most effective image stabilization systems currently available. Throw in the high build quality, including dust- and splash-proofing, and it all adds up to a very desirable package indeed.

Sharpest lens out there. I have the older version, may be time for a upgrade...