OK

Pushkin

Wondo

I think they are. They must work on a deduction basis as opposed to an overall quality. Proofs are expected to be flawless, therefore, any flaw degrades the proof more than a business strike.

Elcontador

Again, it's anecdotal, but I think they're tougher in MS coins. With proofs, it's typically hairlines that bring down the grade. There are more variables that can ding a business strike. I've seen some larger coins (like a Trade $) in PF 4 that looked like someone ice-skated on it, the hairlines were so bad.

michael

it depends but elcon sums it up well

i guess they are all over the place

just make sure you buy the coin not the holder

sincerely michael