I carry an Arca Rm3d, M Line 2 and a 5d2. ... sharper and with more DR than DSLR's ... I'd be inclined to switch to my 14 Megapixel Red cameras because of their superior dynamic range, ...
At the risk of reopening an ongoing debate: the Canon 5d2 is far from the best examplar of what 35mm format can do for either dynamic range or sharpness. Your indication that the smaller format Red has better DR than the 5d2 is further evidence that the latter fall short of the current state of the art for DR in formats 35mm and smaller.