Quanmer, I think what you mean by "sharp edge" is the speed of the drivers. I expect all dynamic drivers, including the Marten Coltranes, lack this as compared with compression drivers on horns. This speed is not fatiguing if the electronics are good, and it makes drums and pianos sound real. I am very happy with my Contrivas Diacera SEs, but they will never equal the speed of my VOTs.
I am totally in agreement about quality speakers revealing the electronic associated with them. I first heard the Sunrays with the Bridge Audio amps, as I think I have mentioned here. They sounded like pretty poor tube electronics. But in last years CES, the same combo sounded great. I suspect that the Bridge amps had been revised.