http://www.dxomark.com/ is a great, comparative, image quality database developed by DxO Labs., objectively comparing the performance of the leading camera bodies and lenses.
DxO is using the database in their incredible DxO Optics Pro software that does RAW conversion and optics and exposure correction automatically, based on the camera body and lens' measured faults. If you camera and lenses are included in their database you need to serious consider Optics Pro. The software removes noise, sharpens lens softness, corrects for vignetting, barrel distortion, etc., all specifically to the body, lens and settings used in each image. I thought that my Canon 5D MkII with 70-200 f4L IS and 24-105 f4L IS were astounding, but this software brings things to a whole new level.
The 5D MkII already has really low noise levels at ISO 3,200, but now I can push well beyond that without fear of noise ruining the image. The perspective correction for wide angle lenses is better than having another lens. It's like my 24-105 suddenly got a tilt feature at 24 mm. I can put buildings down in the corners or horizons near the top or bottom of the image with no fear.
Check it out.
Dave