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Wow, I'm up to about 3,000 clicks on my 5DIII so far and I do not notice any metering issues like this at all. It seems to meter fine. Without direct side by side testing, I cannot tell any differences between the 5Dc, 5DII, 5DIII or my Panasonic G3
I had been using Nikon, which usually gets it right or .5 overexposed. (My D800E is on its third trip back to Nikon for repair, which is why I have a Canon now.) I can't compare to older Canons.
I'm sure results depend on what you are trying to do. Tree branches against sky tend to work badly. Scenes in shade are often too dark. Landscapes are better. What I'd like is an exposure that is designed to produce a high quality raw file, using the maximum exposure that avoids excess clipping (up to the limit of analog amplification in the sensor path).