Actually I've provided four different sources for my claims and injected some humor into the conversation.
Where are your links to prove that the 7D has superior low ISO RAW noise performance to the 40D and 50D?
This isn't about you loving or not loving a camera. This is about the 7D's low ISO noise performance.
Ok, thats fair. I'll reuse one of your own references:http://www.dpreview.com/reviews/canoneos7d/page15.asp
Lets skip JPEG, because we can't really be objective about noise in a JPEG. Different generations and brands of cameras have different algorithms to process jpeg images, different generations of noise reduction algorithms, etc. Not to mention the fact that none of us knows anything about those algorithms... Its impossible to be objective here.
Under the part where it discusses RAW noise. From the monkeys arse (emphasis added):
With noise reduction turned off we get a more accurate idea of how noisy these sensors are and the image looks slightly different to what we've seen above in the JPEG section of this page. The Pentax K-7 is much closer to the pack but it also becomes clear that the 7D produces a cleaner image than the 50D and, at very high ISOs, also than the D300S. This explains to a degree the 50D's slightly softer JPEG output at high ISOs. Its JPEG engine has to apply more chroma noise reduction than on the 7D in order to get noise onto the same level.
Lets assume for the moment that the 7D did have more noise at ISO100 than the 50D. At 100%, even though there may be more pixel-level noise, the chroma sample for the 7D certainly appears clearer and sharper than the 50D. The even lower resolution D300s seems to have better sharpness than the 50D, however if one were to upscale it to the same size as the 50D's sample, the margin would likely shrink. The Pentax, while it certainly has the lowest noise visible in solid flat gray and black samples, appears to be even softer than the 50D! Sadly, this is a subjective comparison, so what I see may not be what you see.
To be more objective, lets take a look at the RAW noise graphs. At Chroma ISO100, the 50D is approaching 3, while the 7D is just above 2.5 as far as I can tell. That means the 7D is BETTER than the 50D...albeit marginally
. Follow both cameras through to the end of the graph, and the 7D is better at every tested ISO setting, the 50D is never better! The story is even better with Black ISO100. Only with Gray ISO100 do the 7D and 50D perform THE SAME at the lowest ISO, but again, following the graph through to the end, the 7D ultimately outperforms the 50D.
Just for completeness, comparing the Nikon and Pentax, they have excellent low-ISO performance, however both has a crossover point with both the 50D and 7D, and perform worse at high ISO.
I can't tell, using your own reference, how one could conclude that according to DPReview, the 50D has "much better" ISO performance at low settings than the 7D. Lets see if we can get a better idea of how well the 7D performs against other cameras than just the ones in its own review. Luckily, newer DPReview reviews allow you to select which cameras you wish to compare. The Nikon D7000 review is a good one:http://www.dpreview.com/reviews/nikond7000/page12.asp
Again, under RAW noise, you can pick the 7D, the 50D, and lets say the Pentax K-5. The 7D has the highest resolution of all of those cameras, I believe...and while it does appear that it is a bit noisier than the others in solid-color samples, the chroma sample appears to be noticeably sharper. Intriguingly, the K-5 seems to improve in sharpness until ISO800, at which point it seems to be the clear winner from both a noise and sharpness standpoint. Both the D7000 and 50D start losing sharpness immediately (not to mention they both start out softer than the 7D). This is a subjective comparison, as there are no charts that directly compare the D7000, 7D, 50D, and K-5, so I honestly can't say whether you will see the same thing there or not. One thing does seem to be sure, though...if you routinely photograph objects with lots of solid, flat colors, the Pentas K-5 is the camera for you. On the other hand, for anything with fine detail at ISO1600 and below, the 7D seems to be the best bet, although the K-5 is a close second. Neither the Nikon D7000 nor the 50D have the same clarity and sharpness as the 7D at any ISO.