Jeff I tested two years ago with my redone and b4 lens without optical adapter and the only problems was coverage, i dind't saw any chromatc aberration or other problems, but 2k was not good enough for me, at least from the old m sensor... I did the test for a pal 4/3 show and the results was good, but not for 16/9 or hd.
Maybe a metal adaptor + optical multiplier can be a good solution. But only a metal adaptor will not. Maybe i can share some images in the next days with my redone + b4 lens without optical adaptor only metal.