I'm interested in getting these, I currently use m50x and IE800, the IE800 are obviously much better but I'm looking to replace the m50x.
Where do the K7XX fall on the spectrum between those two?
JuicyBraHi, the AKG's are an open back headphone, which have a different use than your m50x. While they will sound better to most people, they would server better as an addition (especially for home listening) to your collection than a direct replacement for your m50x. If you want an upgrade for the m50x looks at the MSR7 from Audio Technica.
Where do the K7XX fall on the spectrum between those two?