After reading ecstatic reviews of the JuilliardSQ's 1996 recording of Beethoven op. 130 recording (with the Grosse Fuge) and the valedictory op. 135 I got the CD and was stunned at how messy the playing was. Not just Mann's iffy intonation, but the four musicians didn't seem to be on the same page as to how the music was supposed to sound.
Compared to the wonderful recordings from the sixties this 1996 recording was really a blemish on their record.
There's a Juilliard String Quartet now, with Ronald Copes on second violin being the longest serving member, i.e. from 1997. The other three members joined in the 2010s. In other words it's a completely different ensemble with no real connection to the JSQ from the Fifties and Sixties, and it should at least put "New" before the JSQ name, in my view (which may or may not be definitive).
It would have been much better if this new ensemble had recorded the Hindemith Quartets.