*sigh*, your friend has just discredited himself.
All mass-produced cars under $100k+ use finished or pigmented leather. Finished leather has a flexible coating (somewhat similar to paint) applied to the top that gives it its color and uniform texture. Lexus has optional semi-aniline leather that is a bit higher grade, but truly, the things that make the biggest difference in terms of durability are the backing material and the seat cushioning (firmer seats give the leather less room to "stretch" and thereby hold up better). Some expensive luxury cars have full-leather interiors, but even most cars under $60k have matching vinyl on the sides/back of the seats w/ only leather on the seating surface itself. I've owned many cars with leather seats (BMW, Land Rover,
Cadillac, Acura/Honda, Lexus, Mitsubishi and VW) and find the V6 non-premium leather in the Genesis to be above average in terms of appearance/feel and about average in terms of durability. I cannot speak as to the durability of the ultra-premium leather, but I will say that it feels amazing. Much nicer than any Chrysler 300 I've been in. LOL