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Thanks for alle the answers/ suggestions.
I have now compared my 40D with a 1000D and a 7D. The test have done taking picture of a resolution/noise-testchart. I have used a tripod, both my Tamron 90mm lens and my Sigma 150-500@500mm lens and taken pictures at different ISO-values.
My interpretation of the picture : The 40D and 1000D has about the same noise-level, but the 1000D gives somewhat clearer/better pictures. Withe the 7D I could go approx double the ISO-value for the same noiselever. The pictures was much clearer/better on the 7D compared to the 40d and the 1000D.
The diffence in the lenses was quite small, The 90mm was a little better, but not that much.
I am not satisfied with the performence of my 40D, I will send it in for a check/service.
From these test, my plan forward is probably to upgrade the camera before the lenses. I am hoping Canon will come up with a 7DmkII or a 70D in the near future.