You can go to Bestbuy and hear the MDR-1R anytime you want, but the MDR-1R is much smoother sounding, but maybe a tad less crisp in the midrange. The bass offers more impact and quantity and is a bit looser than on the M50. The MDR-1R also sports a slightly wider soundstage. The M50's advantage is mostly in its midrange, which is a bit clearer and more aggressive sounding than the Sony's, but I think the treble range is more of a wash. Rolled-off treble versus peaky treble...