| i have used both mics extensively in both live and recording situations.
the good old akg offers a much warmer low mid, while the audix is very transparent in that frequency range.
the top end of the akg is much more mellow than the audix which has a much more precise (if not sterile) type of sound.
the results: the akg seems to take a lot less energy(gain)
to get a useful low end in both the studio and especially live.
a nice choice for warm round sounds. i always know what to expect from this mic(i have two at my house gig)
the audix being so precise is nice for a cutting high end,
great for "metal" kick drum.it is a bit of a space hog though...
it has such a clean transient in it's low end(i believe that is a trait of most audix mics, excluding the d4) that you load down your mix unevenly trying to hear the lower frequencies.(after recieving an endorsement for my house gig, i ended up only using their vocal mics.)
imho the akg has a much more useful character.
in conclusion...very different mics, best suited for very different sounds. | 
