I can honestly say that ALL of the Grado cans I've owned or used over the years were rather bright, lean and more than anything, uncomfortable! If you make it for more than 30 minutes with Gados strapped to your head, you must have ear lobes made of steel. I mean, they genuinely make your ears hurt! I started off years ago with a pair of Sony MDR-7506's, then went through about $2200 worth of Grados, and ended up selling all of them and going back to the Sony's. Not only are the Sony's comfy for hours on end, they also sound pretty darn good.
With that said, I've gone through my share of Sennheisers, AKGs and Byerdynamics as well, all the top contenders. In the end, I've ended up with the original Mad Dogs with the upgraded Dog Pads. To me, they are the overall best performers. I need my cans to be closed, and these are the best sounding closed cans I have heard so far. I listen to everything from classical jazz to modern and fusion jazz, classical, orchestral, pipe organ, blues, pop, rock, even some dubstep every once in a while, and these Mad Dogs do it all quite well..
One of the key requirements to getting these cans sounding great and performing well with all types of music I think is getting some major power behind them. I've tried several dedicated headphone amps with them, both SS and tube, and none of them bring these cans alive like my old, trusty vintage Sansui receiver. This thing just has gobs of power on tap and has absolutely no problems throwing some current at these cans when the music demands it.
With the Sansui powering the MDs, they have plenty of bass depth and impact, midrange warmth and clarity, and sweet, detailed treble with better than average imaging and sound staging. I'm quite content with my original MDs and will eventually upgrade to the latest and greatest MDs, but I'm certainly in no hurry to do so at this time. They just sound so darn good, I don't want to be without them for any period of time, or worse yet, upgrade them to something I might not like.
Of course, this is ALL my own 2 cents and YMMV.