I have had my K271 MK II's for about 6 months and I have been overall pleased with them. however, I really wanted an open back over the ear headphone, and at the time of purchase, I could not find a K240 series for the same price. I was thinking the K601's would be a good upgrade.
I enjoy the AKG sound profile because I dont listen to one or 3 types of genre's. I listen to basically everything (well, minus a lot of the new popular tunes) so The AKG's suit me well. Yeah of course I would love a little more bass from the K271 mk II's but the soundstage is great. before the 271's I had a sennheiser PX 100.
I really enjoyed that until the pads wore down to nothing and it started to hurt like hell wearing. I wanted something over the ear instead.
Again, I am looking into the K601 because it is more of a studio headphone, it has larger drivers (I think) and works well with amps.
I have heard that the K701's and 702's work better with solid state amps rather than tube amps, and I was planning on trying to build a tube amp somewhere down the line.
any adivce would be appreciated. Thanks.