Camera Size now has the Fujinon GF100-200mmF5.6 R LM OIS WR in its comparison tool. I put together some comparisons with it for you guys, but if you want to make your own you can do so here. I think the Sony and Nikon 70-200 f/4 lenses are the most interesting to compare to the GF100-200mm since they have similar rage and speeds.
The Fujinon GF100-200mmF5.6 R LM OIS WR is also very well priced compared to other similar lenses so it should be popular for photographers that like to use their GFX for everything. It will be even more useful and interesting when the Fujifilm GFX100 comes out. Hopefully, the IBS and lens OIS will work together to give us over 5 stops of stabilization.
Fujifilm GFX News, Rumors, and Collaboration
Fujifilm GFX Owners Group
Fujifilm GFX Page
GF100-200mmF5.6 R LM OIS WR: B&H Photo / Amazon / Adorama
Fujinon GF 250mm f/4: B&H Photo / Amazon / Adorama
Fujinon GF 1.4x Teleconverter: B&H Photo / Amazon / Adorama
Fujifilm GFX50R: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama