Even horns of the same make and model can sound different. There are lots of factors involved.
My horn does sound as good as a Mark VI. I've heard both. I've heard more Mark VIs than any other horn except my own. Now, I'm not saying my horn "plays" better - just that it sounds as good, or even better, than the Mark VIs I've heard. I'm pretty certain that a Mark VI is easier to finger than my horn is. My theory is that many people obtain a Mark VI for it's action plus the sound. Of course, back when the Mark VI hit the horn market, there was no Internet and many pros got a Mark VI simply because of the "word on the street." This perpetuated it's popularity as many famous people started playing them in clubs, cutting recordings, etc.
Overall, I think the best horn is the one that makes you happy. We all enjoy different sounds, pitches, tonal quality, etc. I gave up on sounding exacting like "so and so" sounds. I'm sure it can be done, but I'd rather be unique anyway. To me, there is no point is doing things the same way they've already been done. I managed to hear "a little" of Arthur Blythe the other day - maybe 30 seconds of "Sentimental Walk." Gosh, he sounds great! I AM going to purchase some of his music when I obtain enough funds one day.
How many days left Fish?