Even though Pentax has made some ugly cameras, such as the SF-1, I think the MX is a touch better looking than Oly's OM series. Come to think of it though, Olympus has created some ridiculously ugly cameras as well.
I like some of the older Nikons, especially the RF's and the 35 Ti is sweet, but I'm put off by that red logo-ish design on their modern dslr's.
All in all though, I find Leicas to be damn fine looking overall. Now, if some Leica dealer would just give me one I'd really wax poetic. lol