Well, the two in my shop are , at least for me near the top of the food chain:
Holgrook H-15 15x36 with taper attachment, lead screw reverse with micrometer stops, 1 lever change to go to Metric threading, fully covered ways, 2" spindle hole, 22-1500 rpm with one lever to shift the 16 speeds, unGodly repeatability and rigidity due to it's 6700lbs of cast iron and heat treated steel. Plows metal off so hard that the chips sound like coil springs when they hit the floor, but can dust off the tenths with a sharp tool, clutches that actuate with a pinkie finger. Tony at lathes UK said they were very expensive when new, and very high class machines; I agree. I also can't imagine even dreaming of a better machine, at least for what I do.
Pre-war Rivett 1020 toolroom lathe, 10x20", taper attachment, lead screw reverse w/micro stops, 5c collets direct in spindle, 9 sliding way surfaces that the carriage is supported on, precision everywhere, a little kooky to run, pleasing to the eye unique and ridiculously complex/precise/rigid and costly-to-build design, and only 20 or so ever made.
Come over and see them if in the area, Brett in Vancouver,WA