I find that the three or four of my 20 or so cartridges that I like the best tend to sound quite the same to me if I were to close my eyes. And I like to think that this is because I am drawn to their neutrality more than anything else. In other words they do everything right and the result is they are going toward a central character that I seem to prefer.Oddly enough, two of these are MC, one is an MM, and one of these is an MI cartridge.
If you cant hear significant differences between MC & MM cartridges you must be deaf. If you think that your favourite cartrdiges do everything right - you must have low standards. There are no cartridges that do everything right regardless of price - every design is a subject to the designers own aspirations or goals and what compromises are acceptable to the designer in order to achieve their particular goals.