Rented an XF + IQ4 for a studio lookbook and the tonality/skin rendition blew my A7R V away, but tethering dropped twice and AF lagged when the model did quicker turns - killed the flow. Are you seeing similar on Phase/GFX, or have you gotten comparable color and falloff from a GFX 100S or R5 + Broncolor/Profoto without the headaches?