We sold loads of AT-F5's, OC7's and OC9's back in the day as well as one or two OC30's and they all have a family sound. Taut bass with no overhang, a light midrange and a treble region which showed only too well if the record being played had an upper-mid and treble boost. The Kontrapunkts, IIRC, had a more "Koetsu" romance in the tonal balance - what they lack in truthfulness they make up for in warmth and "nice-ness." A long time ago now though since I heard them.....
Of the AT's, the old OC30 pointed the way to the 33PTG. I don't know how the other 33's compare to the PTG, but this latter seems to be "the one" for this European climate, the others maybe better for the very different Japanese climate.
I think the AT33e was the only one to be "officially" imported over here (hopefully someone will correct me) and reviews from the mid eighties indicated that the bass to treble quality wasn't quite "balanced." Certainly, the vapour deposited cantilever and tiny ML chip of modern AT's seem to give a better bass reproduction than former models.
The PTG seems to have a slightly "beefier" quality whilst keeping the AT sound. The OC9 is still a bargain though. See if Dave can do a deal on one.....
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me