^^^ I haven't heard the AT150AV, so I really can't comment on it.
I recently had the opportunity to hear an ultra expensive audio system with a retail value of over 300k. It had three turntables, one of which had the Lyra Etna cartridge on it.
I couldn't help making comparisons with my own much more modest system of course. While the more expensive system played MUCH larger than mine (The Big Wilson's), it occurred to me that my system, as far as tonal balance and overall musicality is concerned, gave up nothing.
What I noticed about the Lyra Etna was a rising top end that was causing a bit of unnatural brightness to the highs. Now, this may have been caused by the setup and not by the cartridge itself, but I couldn't help thinking that the AT ART-9, especially for the difference in cost, really didn't give up much of anything, and actually gained with a more natural sounding treble. Again, this is no slam against the Lyra at all ... it sounded fantastic. But for my money, I'd go with the AT-ART9 and keep eight grand in my pocket.
Frank