I got this when I got the K812, but it's been set aside for awhile while I enjoyed the heck out of that K812. Still, if the K712 were the only headphone I had for the rest of my life, I'd be delighted - it's a great sound. The lower bass is light I think, but the overall bass and tone is so good that I could enjoy it on most music without a bass boost. It also looks good, which doesn't hurt...
http://www.hifiheadphones.co.uk/forum/showthread.php?t=4142
http://www.hifiheadphones.co.uk/forum/showthread.php?t=4142