AKG Headphones: New K272 HD vs K702 vs Beyer ?

I'm not that familiar with the AKG headphones, but they seem to get high praise when I do see a comment about them. I know the K701's and K702's are the usual contenders, but has anyone compared these to the newer AKG offerings like the K272HD?

Also, has anyone compared the AKG cans to the Beyer Dynamic DT880's?

Right now I'm using a pair of Sennheiser HD595 phones with a dedicated headphone amp by G&W. I think they sound pretty good and of course their character changes with different interconnects between the source and amp. My goal is to improve on the Sennheisers with phones that may be more detailed and have a touch deeper bass. I don't find the Sennheiser 595's particularly lacking... the fact that I'm getting such good results that it has me curious to try other headphones that may be even better. I mainly want natural sounding phones that are great in the midrange and pretty good elsewhere.