mom had (key word HAD leather , mom has two fat LAZY cats. Well those FAT LAZY cats came to life, on her leather couch). they scratched it, they bit it, they used it as a giant play toy. (instead of thier scratching posts, thier toys, and thier cat furniture).
she had a giant 1200 dollar cat couch in her living room.
I'd not risk it.
if you want to do the soft claws...and do a "trial" run...RENT or BORROW a leather couch for a month and see how it goes. But NO WAY would I BUY a couch without first "trial"
to see what your kitties will do.