Canon 40D picture quality issue!

[Tallyther]

I don't know if anyone else has experienced this or not but I would appreciate any feedback.  I have owned a Canon 40D for about a year and a half. I had been asking for advice on buying some lens on this forum and economizing as much as possible. I bought a 70-200mm f2.8 L IS and a 300mm F4.0 L IS, both with acessories rather than getting one 300mm f2.8 L IS. In preparation awaiting arrival of the two lens I updated my firmware.  I did it about a year ago too! The point is when I tried my two new lens I thought the pictures were inferior quality.  I was torqued and considered returning the lens. I did a bunch of tests. The bottom line is I traced everything back to the firmware update. I manually reset all my camera default settings even if I didn't change the default value from what it said.  Now my pictures are coming out fine. 

Has anybody experienced this and what did you do?  Do need to send my camera in for service?

[Bob Atkins]

It would be vety strange if a firmware update affected picture quality in a negative way. I've never really heard of that happening.

If your pictures are fine now, I wouldn't worry about it. There's really nothing to service on a DSLR unless you're actually having a problem