I will chip in even though I am no dealer. To start with, Chingbo may need leaf shutter lenses to sync strobes outside, without losing power to HSS. He may also prefer the bigger sensor, for a greater "MF effect". Not everybody likes to look into an EVF - some people prefer optical. I don't know how serious the reported "banding issue" with the GFX100 really is (where the rows of pixels used by AF are) or how hot/noisy the Fuji sensor gets after a full day of shooting, so no idea if that might be a factor. The ergonomics of the Fuji GFX100 may not be everyone's cup of tea. The modular solution of a separate body and back has some advantages (can use the back on a tech camera or the latest version of the RZ67, can buy a spare XF body, upgrade the back to IQ4 and keep the body, etc....). I had the GFX50S and sold it. Shooting with P1 XF and IQ3100 now. The back was purchased s/h, through this forum, camera body and lenses also s/h, mostly from Teamwork in London and here, again. In the end, I did not pay dramatically more than for a new GFX100 system (maybe a third...still meaningful but nowhere near the new price differential). Happy with the combo and the seamless integration with C1. The files are amazing and provide great latitude in PP. Reliability has not been an issue, just had to adjust AF with some of the lenses that back-focused. HAP1 or HAP2 don't make a ton of difference, in my experience - the "true focus" feature (or whatever P1 call it) has not been entirely predictable to me and I tend to keep it off. I've had comparable results with both versions of the body (HAP1/HAP2) in the studio, in terms of AF accuracy. Tethering drop-outs solved by adding a high-powered USB port before the orange Tether Tools cable (powered dock from OWC). In short, I had the opportunity to buy the P1 equipment on the (relative) cheap before the GFX100 became available and I also reasonably often shoot outside with strobes (and the Profoto trigger integrated in the XF is nice), so that was my choice and I neither regret it nor hanker after the GFX100. Whenever I need a camera with EVF and faster AF, I shoot with a smaller system (Leica SL2). To my mind, the GFX100 is trying to be the master of all trades but perhaps that is not always necessary. In my world, the Phase lives in the studio and goes out only when I shoot with a team/assistant, the weather is nice and we can drive more or less all the way to the location. Whenever I shoot alone, or there is a chance of rain, or I shoot with a model in a hotel room without wanting to raise staff attention, or a longer walk to location is needed, I usually take the Leica with one or two small battery strobes or LED lights.
