I use the CV 28mm f/1.9 ASPH with Leica UV/IR filter on my M8. It's a fantastic lens. There could be a bit of veiling flare wide open but I also think that the filters have a lot to do with this. They are not multicoated and the way they block UV/IR is through reflection but this also causes reflections. With or without the filter, it's a great lens. I've not seen any focus shift with this sample and highly recommend one for a wide-normal 35mm-ish lens equivalent for the M8.
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