I have used different grades of katzkin leather in no fewer than probably 25 vehicles, as a former dealer. More often installed in our new Pontiac's, and the occasional Buick that had all the options the customer wanted minus leather.
I installed katzkin vinyl in my personal jeep, and was very pleased with it, as well (but it served a different purpose...hose friendly).
The leather, even in the middle grade (non vinyl) was a better quality than was used in new Pontiac and new GMC, and about on point with Buick. The premium grade was nicer than either offered. You have the choice to order it flat finish or ruffled...the ruffled being a little more plush/soft/loose looking, the flat being like a seat in a VW, flat tight leather. It always looks a little funky for the first couple days, but settles in very nicely after a few days time and a few temperature changes.
I love the stuff, and will be replacing my beatup front seats and captain's chairs in short order with factory match color. Probably won't touch the rear.