I have used a good copy of the Flektogon with a normal adapter (Kiwi) on an X-Pro1 and I was quite happy with it. However, I now have switched all my gear to AF lenses. I'm a bokeh whore and in lots of situations you need to focus quickly to get the shot. AF is the way for me.
So if money is an issue the 27/2.8 (which should be an ecellent lens, I do not own it however) my advice would be: Go for it. Or any other Fuji lens which are all superios quality wise. They are excellent. And the AF of the newer camera models is as well.
Here are some examples of vintages lenses (inclusing the 35 Flektogon) on my X-Pro1: https://www.flickr.com/photos/punkfurt/albums/72157652911947803
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X-Pro2 RAW LR Conversions: Darker than JPEG