Upload & Sell: On
Presuming that is the same Minolta design as my Leica R 28mm f2.8 Elmarit, I will check mine on the A7r. I had expected that this lens would need to be replaced for usage with the camera. But, maybe... Also,I have the Leica R 28mm f2.8 Super Angulon PC (Schneider) which is heavy could at least for sometime (and also for PC control and stitching) could be used on A7r. The same for the Leica R 21mm f4 Super Angulon (but it is supposed to fall off for sharpness from the extreme sharpness in the center).
If I am remembering right, which is always a gamble, I think it is the Minolta 24 f/2.8 and not the 28 f/2.8 that is the same design and the Leica R 24 f/2.8. The Leica R 28 f/2.8 comes in two version neither of which are similar to the Minolta 28 f/2.8, which again if I am remembering right is a cheap and less than stellar lens. The first version of the Leica R 28 f/2.8 is fairly mediocre, but it should still be a much stronger performer than the Minolta 28 f/2.8. The second version of the Leica R 28 f/2.8 should be exceptional if working well.