Canon T1i / 500D vs Nikon D5000 vs Olympus E-620 vs Panasonic G1 Noise Comparison at DPReview – The E-620 and Lumix DMC-G1 don't perform as well as the bigger-sensor cameras here, namely, the D5000 and EOS Rebel T1i / 500D / Kiss X3.
Canon T1i / 500D Reviews
Canon T1i / 500D vs Olympus E-620 RAW Image Quality Comparison at DPReview – The EOS Rebel T1i / 500D / Kiss X3 wins on detail captured.
Canon EOS Rebel T1i / 500D Review and Sample Photos at DCResource – A nice touch at DCResource is the inclusion of a review of the software that comes with the camera.
Jeff Keller notes the following with regards to image quality:
Photo quality has always been a strong point of Canon D-SLRs, and that's generally true with the T1i. The Rebel T1i takes well-exposed photos, though it does clip highlights a bit more than I'd like. Colors were pleasing the majority of the time, except with the night and indoor church shots, which had noticeable brown color casts. As with other Canon D-SLRs, images straight out of the camera are on the soft side. You can bump up the in-camera sharpening by using the Picture Styles feature if you think so too. The camera keeps noise levels very low — you won't have an issue with it until ISO 1600 in low light and ISO 3200 in normal lighting. Higher sensitivities are quite usable if you don't mind shooting RAW and post-processing a bit. Like with its predecessors, the Rebel T1i has a bit of redeye problem, and there's no way to remove it on the camera. Purple fringing levels were fairly low.
There's also a gallery of full-resolution image examples for you to assess the output quality of the T1i / 500D with.
Canon Rebel T1i Review at Photography Bay – Eric enthusiastically recommends the T1i / 500D:
Overall, I highly recommend the Canon Rebel T1i to anyone looking for a feature-rich and very capable DSLR on an entry-level budget. There are plenty of great DSLRs on the market – some offer more features and some may be cheaper. However, this is the best Rebel yet. Image quality rivals cameras much more expensive than it and, if you buy something cheaper, you’re going to miss out on some cutting edge stuff that only the Rebel T1i offers.
Canon EOS T1i / 500D vs Olympus E-620 vs Nikon D5000: Review, Sample Photos and Video Clips – This article at quesabesde.com is written in Spanish, so you might prefer to read Google's English translation of it.
The respective kit lens for each camera was used for the test: Canon EF-S 18-55mm IS VR on the T1i / 500D, Nikkor 18-55mm AF-S VR on the D5000, and Zuiko 14-42mm on the E620.
Tons of full-resolution images await your analysis.