Time To Upgrade My Camera?

If you have a good sharp lens then the 90d looks like a great improvement.

Personally when I upgraded I bought then sharpest lens possible and just bought last years camera used.

Canons 100mm f/2.8 is very sharp they are built great and last forever.

I've been trying to upgrade my camera for more than 5 years now, with no luck. In trying to stay with Canon, I purchased a 5DSR, but the pixel level image quality was not any better than my T2i. The 5DSR has a special high resolution mode, but it's just a small-radius sharpening mode that can be implemented on any image. I have considered going Nikon but I don't expect much better performance than the 5DSR. Last year I tried the Sony A7Rm3, which on paper was a coin photogs dream camera. I do like mirrorless for their short register distance, and the A7Rm3 has EFSC, and pixel shifting. But the unfortunately the pixel-shifted images looked very unnatural due to the software over-sharpening the image. The user could not turn off this ghastly effect. Supposedly Sony has fixed the problem with their newest version of the Imaging Edge software, and they now have the A7Rm4 with a 16-image pixel-shift mode, and 61MP single images. I'm thinking seriously about going with this one, but the T2i is still going strong and I expect the A7Rm4 to be just a small improvement. The real impetus for going with a new camera will be if I can ever build my Stack and Stitch system, which will benefit greatly from a FF camera. Once I do that, I expect to upgrade fairly quickly since I'll need to do a 15-image (3x5) panorama with APS-C camera, and can get that down to a 6-image (2x3) with a FF camera. That's where the A7Rm4 will give me some benefit, but until then I will be happy with the T2i.

Hmmm, any suggestions on what I could be doing wrong here? Same coin, same lens but new camera body (90D) however the new body - despite my attempts to mimic the settings on my older Rebel 550D - seems to be showing the coin with a lot less colour vibrancy ... any ideas what I've done wrong?

https://drive.google.com/file/d/18s...?usp=sharing

The pictures look great. You should be asking how accurately it shows the coin itself.

Is this just a matter of white balance?

The copy stand I'm using has a base that's 18% grey with a white grid, before I take the shot I use the EOS utility white balance picker and select either the white or the grey ... I'll post the raw file when I get in front of a computer (note it's a CR3 not 2 - alternatively I can post a JPG)

You're using Live View in both cases? All the same settings, including the picture style and its subsettings? Did you try shooting a grey test shot for each to make sure they are both white balancing the same, ie do the white balance and then immediately shoot the background. Are you white balancing with the grey background in focus or out of focus? Exactly same lens settings, and no change in lighting?