I have often seen the ATH-M50's referred to as having a "V-shaped" sound. I have also often seen them referred to as being somewhat, or mildly bass heavy.
I saw a post somewhere where someone said that later production ATH-M50's are more neutral and less bass heavy than ATH-M50's that were produced years ago. Basically, someone was saying that newer production ATH-M50's sound different than older production versions and are more neutral. I've never been able to verify that or seen any documentation about that.
All I can say is that I must really love a V-shaped sound, because I use my ATH-M50's with a FiiO E17 DAC/amp, and I leave the FiiO E17's tone control set on +2 for bass (which is the first step up from 0) for all types of music and everything I listen to.
I have the new model ATH-M50's in white that just came out recently, so they are definitely the newest production. In my experience, they have improved after burn-in, so I would be hesitant about any demo of ATH-M50's straight out of the box.
I really, really love these headphones and think they sound fantastic. I always do a little EQ'ing with anything I listen to in order to get the sound just the way I want it. I listen to rock, indie, hip-hop, reggae, blues, country, etc. and some jazz. I find the ATH-M50's to be very versatile.
I have not heard the other headphones listed, so I can't compare them. I do think the construction or build quality of the ATH-M50's is top-notch. I only use my ATH-M50's at home, so portability issues aren't a factor for me.
Are there better headphones for the same price? I don't know. All I can say is that the M50's are very good and certainly not a bad choice if you are looking for a closed headphone in their price range.
