It won't be a very good review using old lenses, not that they aren't excellent, I am always please with the results from all of the old primes I have, although in all honesty
Lee, it won't be a very good camera if the better legacy glass isn't capable of taking full advantage of it. Pentax's new digital lenses are (i) way overpriced; (ii) not terribly useful focal lengths; and (iii) in fairly short supply. Lovely that they are weather sealed and, in the case of the 90mm, apparently stabilized. But the 'Pentax advantage' is price, a key component of which is the older, lens expensive glass, or, newer, less expensive glass.
If I have to drop $4K on a Pentax 90mm, I'll buy a used Hassy 100mm f2 for $2,500 instead, thank you very much.