Many... CLD-D925, DVL-919, CLD-600, CLD-2950, LD-V4300D, plus a Philips LDP600WS that should be aligned...
Yes, PAL average is fun, but also a lot of work! A funny work, indeed, I must admit, but quite hard to align 3+ copies, if the cropping varies wildly like the OT laserdiscs...
Without detracting from the excellent work althor has done, the Pioneer HLD-X9 is the second best laserdisc in the world; apart its excellent comb filter, it has the red laser that should resolve more details than a non-MUSE laserdisc player; plus, I have two copies of the NTSC US box set that could be used for average.
Althor's capture card, however, is better than mine, so the final result should be tested; a raw capture of, let's say, 1 minute, will be useful to make a direct comparison.