My reason for buying an XE-1 was to get some Rokkor prime lenses (28, 50 and 135). Ideally I wanted to get Nikkors but I can't afford them. Similarly specified Rokkors are between a quarter and a third of the Nikkor price (at least in the UK).
I totally agree about them being a bargain.
I have also just bought a couple of SRT 100s. My daughter now has one of them.