The folks over at Mobile01 made the best and most interesting comparison between the two bodies:
Sony A7IV preorders (Use those affiliated links to support my work. Thanks!):
In the USA at BHphoto. Amazon. Adorama. FocusCamera. BuyDig.
In Europe at Fotokoch DE. Calumet DE. Foto Erhardt DE. Park UK. Wex UK. Amazon DE. Amazon UK. Amazon IT. Amazon ES. Amazon NL.
In Australia at Sony.com. CameraPro.
Sony HVL-F46RM Wireless Radio Flash at BHphoto. Adorama.
Sony HVL-F60RM II Wireless Radio Flash at BHphoto. Adorama.
Sony 70-200mm GM II Lens at BHphoto, Amazon, Adorama. BuyDig. FocusCamera. FotoKoch DE, Calumet DE, WexUK, ParkUK.
Join our Sony A7IV Facebook group (Click here).