I made a record at AIR Monsterrat in the period when they had one A800 and one Mitsu X850 (or 2 perhaps).
I was trying hard to keep everything 24 track , and analogue, but on one song we were using a lot fo tracks and so we used the 850 as a slave and did most of the guitars on it.
When it came time to mix, the difference was striking.
no matter what, the guitars on that song just did NOT sit in the record correctly.. just thin and gutless in comparison.
Like the difference between seeing it there in front of you, or seeing a colour transparency.
Flimsy.