[Leica] Canon 5D + Leica Lens Exposure Question

[rbaron at concentric.net (Robert D. Baron)]

I know some of you have been using R lenses on the Canon 5D to great
effect.  I spent some time over the weekend using my 5D and various of
my medium and longer R lenses and I found I was getting images that were
overexposed much more than I would have expected.

I was shooting outdoors in mixed sunlight and shade, and even though the 
part of the scene in sunlight was the vast majority of the frame (and 
was centered) the camera seemed to be exposing for the area in shadow.

I am setting the camera to Evaluative Metering, Aperture Priority auto 
exposure, and shoot either wide open or manually stepped down.  The 
camera of course sets the shutter speed.  I'm working down my mental 
checklist of things I could be doing wrong but don't find an obvious answer.

Have any of you who have used this particular combination seen this 
problem or have a suggestion as to what I might be missing?

Thanks,

--Bob