The Olympus OM-D E-M1X has a select niche following, but does it really need to be the size of a medium format camera? Also, the OM-D E-M1X only has a marginal weight advantage weighing in at 400g lighter than the GFX100. Olympus really needs to work on making the OM-D E-M1X smaller, lighter, and cheaper in the future. You can compare the cameras here and here
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Olympus OM-D E-M1X: B&H Photo / Amazon / Adorama
Fujifilm GFX100 (Preoders): B&H Photo / Amazon / Adorama