x_tan wrote in post #13063349
Ok, some photos example:
Low lighting:
5D2 + 85L @ f/4, ISO 3200, 1/60s:
Making Syphon, St. Ali, South Melbourne
by
X_Tan
, on Flickr
550D / T2i + 24L @ f/4, ISO 1600, 1/20s:
Making Syphon, St. Ali, South Melbourne
by
X_Tan
, on Flickr
How did you crop these photos? Also were you in the same spot for both cameras or did you move to get the same framing? I'm wondering because the 550D combo is equivalent to almost 40mm, pretty wide compared to the 85L. If you're cropping a lot of the 550D image to get the same framing, then it won't be a fair comparison because you'll be enlarging the noise. Also because the 5D image is a rectangle, while the 550D is a square.
Edit: Ok, I take too long writing as usual :P. The 550D image is definitely nicer noise-wise w/out the crop.
Also, depending on your processing (if you added more contrast or push the exposure), it would also bring out more noise.
To the OP, if you don't shoot low light that much (or if you use flash), then higher isos may not matter to you. To some, it does matter, and the better noise characteristics at the higher isos is reason enough to switch. If you're doing a lot of daytime shooting, where there is plenty of ample light, then the differences may not be so great between bodies.
I think a lot of people upgrade to the higher end bodies for the other features like better AF and burst speed. I don't know if I'd call those "bells & whistles"...those things will allow you to get the shots that may be otherwise extremely difficult to get with a rebel body.
It seems you're only focused on image quality...but image quality isn't the main difference between higher tier bodies...for a lot of the bodies it's the ergonomics and (better) weather sealing, AF and burst speeds.
For you, if image quality is your focus, then the 5D (classic or mark ii) probably would be your next camera. Again, I'm not sure how much of a difference it would be if you don't shoot low light.
I can't answer any of your other questions because I only have 1 DSLR (a 7D from a SX10 IS).