Coverage cannot properly be assessed on the ground glass, only on a neg or a print. I say this because I have put lenses which are miles short of 'useable sharp' coverage on my 10x8 and they illuminate the GG nicely. Resoultion cannot be assessed on GG as it is far from smooth and shows very poor detail relative to a print and certainly will not show up slight softness which even maked eye inspection of a neg will reveal. Enlarge the neg 5x and issues invisible on the GG will become monstrous!
Were I shooting 5x4 I would have no reservation, but with 5x7 and the fact that the Perez/Hevanet test suggested this lens is not the best at the edges made me ask. With the stated 250 ish coverage I am going to be nearer the edges with 5x7 than 5x7 would be, especially if I use movements.
My 159 Wolly 12.5 was supposed to cover 10x8. For contacts maybe, but for enlargement it was horrid at the corners. Looking at the GG none of this was aparrent. Even nake eye inspection of the negs showed how little GG really shows regarding sharp coverage.