Although I'm keen for the xpro2 to finally show up, the X-T1 is still a fabulous camera. I had great fun at a studio in London called Beltcraft, using a mix of constant lights, speedlights, gels and smoke ( and also some natural light of course ). Here is the post on my blog.
http://www.mikecroshaw.com/2016/02/19/fashion-shoot-at-beltcraft-with-the-x-t1/
The speedlights I used were Cactus RF60s. I do like the Cactus system although the batteries you use are really really important, I was using 1900 Eneloops by mistake ( thought they were my normal 2500s ) and the recycle time almost drove me to despair. The lense I used most was the 56 1.2, followed by the 50-140 2.8, which I use a lot in the studio and is amazing. Hope these are of interest.