I was always a big fan of the ceramic pickup SR5 so when I made the change back to 4 string then the Sterling was the one to go for.
On paper, the specs are pretty much identical but they don't sound the same at all. Still very much in your face but not quite as grindy as the SR5s.
As above, they should be lighter than an SR4, having a smaller body and narrower neck but in my experience they feel heavier.
I was on the lookout for another one a few years back and managed to pick up a used Sterling 4HH in black with matching headstock which I haven't seen that often before. In truth, I was waiting for the 30th anniversary model to come out last year but instead they seem to have discontinued them which seems odd as I am sure that there would have been enough of a fan base to make it financially viable to have made one, even if it was the last production run of them.