It was the most beautiful transparency film Fuji ever made, although not as sharp as Velveeta and better suited to large format in that respect. Unfortunately, even when stored in a freezer for, say, five years past its expiration date (in other words many years ago), it went magenta. Too bad Fujifilm hasn't used its capabilities to bring back Fujichrome 50D instead of Acros.
I loved Fujichrome 50 (I do not remember the D part of the name). I used it in 4x5 in the 1980s and 1990s. Here is an example of an abandoned motel in Mississippi. Unfortunately, I cannot comment on whether frozen film is still viable.
Sorry, I only used velvia film a couple of times in the 1990s in 135 size. It was not my style, so I did not use it any more. So I can't comment on a comparison with Fujichrome 50.
I shot quite a bit of it in 4x5. It was a lovely film. I'd be surprised if anything that old, even frozen, would still be good, and would expect highlight crossover as well as anemic color. But no harm in trying.
I have shot some of this in 4x5 and also 120. The 4x5 didn't seem any better then what you'd get from todays RDPIII film. The 120 was long expired and had heavy fog to it. But I managed to get a usable result from it. I wouldnt recommend shooting any today though, as the results will mostly likely be very poor.