I have definitely experienced this. Interstingly, it seems to be a bit dependent on the lens. I've mainly noticed that on shots taken with the 70-200 2.8, I find myself desaturating a bit, whereas with my consumer-grade 28-200 3.5-5.6, I find I often boost saturation slightly. I guess this is not totally unexpected, but the degree of difference still surprises me.
All this is purely "uncontrolled" testing. I plan on dong a controlled test (camera on tripod, saturated scene, manual mode, swap lenses, compare saturation) when I can do some outdoor work comfortably.
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