I owned 2 HK's a 9 and a .40 and they were both very nice guns but I have smaller hands and they have very large grips. Glock seems to have a very canted grip so I am not fond of them although they are great guns.
I have a Sig P220 in .38 Super and I love it. Also a S&W 1006 10mm. Both fit me well because of the single stack clips. The sig is a lot nicer gun. It's a bit like boats, buy what you like, but don't buy a that POS you friend is selling.