Why not do some research for yourself and read the reviews online? At least that way you won't get caught up in people's biased opinions and can base on actual, controlled tests.
For example, there's DXOMark:
http://www.dxomark.com/index.php/en.../(brand)/Canon/(brand2)/Nikon/(brand3)/Pentax
K5 and D7000 and A55 (all based on same sensor) all handily beat the 7D in terms of ISO performance, Dynamic range, etc.
Then there's DPreview, where on the "compared to" section you can select other cameras and ISO ranges.
All it takes is a little initiative.