The 18-135 lives on my X-T1 almost permanently. Unless I'm on a wide angle kick which sees the 10-24 in action. The 18-55 lives on the X-Pro1 with the 55-200 for longer stuff, although I'll often just crop into 135 shots if I don't want/need A3+ prints from the files.
In response to an earlier question re moving from FF to Fuji... I chopped a D800 in against the X-Pro with the 18mm and a free further lens and got enough change to almost cover the 18-55-200 zooms. Absolutely no regrets - in 1 month of ownership of the X-Pro, I had taken more shots than I'd put on the D800 in just over a year! Liked the X-Pro so much that when the X-T1 was announced, I was 2nd in the queue for one in my local retailer on the basis of a quick play with a rep's sample - the SLR like handling with proper dials just felt so right to me! Having said that, I still have the Nikon kit but now it's a D750 rather than an 800 (as well as a 700 that's all but retired) and enjoy using that as well when weight isn't an issue. The main reason for the FF body is wide angles - I use a 12-24 a fair bit and also a fisheye (which I possibly use too much!). The Nikon is also better at high ISOs, although not hugely in real life. If I absolutely HAD to keep just one system, I'm not 100% sure which it would be, hopefully the situation will never arise!