King Furniture do sell the higher grade leather, and Leather Rep. do sell it too (in their high range, low-mid range I'm not certain what type of leather they usually are).
Common ones are full/top grain, corrected grain, split and bycast (how ever you wanna spell it) in descending grades. I would suggest stay away from the later two.
Years ago we would have never dreamt of getting a leather lounge but now that is mainly what shops are full of, it gets a bit confusing with all the different leather qualities, Plush explained it pretty well to us but we still don't know which ones to get. We looked at some barstools that were "commercial" grade vinyl and apparently they wear just as well as leather, they look and feel completely different than OLD Vinyl.