Would be grateful for you to post your impressions here even if you've only heard 2 of the 3 headphones mentioned in the thread title. How does the K272 HD compare to the older K271 Mk. II - does it have the same sound signature but just does everything a bit better? And how do either the K272 HD or K271 Mk. II compare to the new Shure SRH940 - from what I've read they might all be on the cold/bright side of neutral - but how do they compare to each other in midrange, treble and bass? Thanks alot in advance for your responses!!