I just had a shooting test of Panasonic GH4 firmware version 0.4 in variable frame rate recording mode.
Camera setting : system frequency 24.00Hz.
1920x1080 at 100mbps
Lens : Lumix 7-14 mm F4.0
White Balance : 5600k
ISO : 200
Profile : Natural, Contrast -5
I put the original MOV clip to Premiere Pro CC with no any transcoding and no any adjustment. Then Export for web at 1920x1080 24p.