I just got a couple of 600 EX-RT's for use with my 5D III. Full-support of the 600 EX-RT with the 5D Mark III does in fact mean you get full control of the flash using the LCD, including all of the wireless options. I'm assuming the older bodies just don't have the firmware to do this (maybe there is some hardware required as well).
Well that was quick; got it working. On my EOS 5D IV, I went to Menu | Wrench #4 | Communication Settings | Built-in wireless settings | WiFi Function and deleted "Set 1" (which had contained older connection information). I then re-created "Set 1" using the "Easy Connection" method and followed the on-screen instructions.
You’ll need to first check and see if you have a camera supported by the Canon EOS Webcam Utility. Fortunately, the app supports both Windows and Mac computers and the list of supported cameras is quite expansive. EOS DSLR Cameras. EOS-1D C; EOS-1D X; EOS-1D X Mark II; EOS-1D X Mark III; EOS 5D Mark III; EOS 5D Mark IV; EOS 5DS; EOS 5DS R
If the video system format does not match the TV's, the images will not be displayed properly. Set the proper video system format with the [ : Video system] menu option. Do not use any AV cable other than the one provided.

Canon 5D Mark IV Review - 5D Mark IV Specifications. Canon 5D Mark III 5D Mark III vs 5D Mark IV: DCI 4K video, Dual Pixel RAW, built-in Wi-Fi with NFC, built-in GPS. Buy the Canon

Built-in GPS and Wi-Fi with NFC; Now, let's talk about some of the biggest benefits of using a Canon 5D Mark IV in 2023. Sensor Quality. The 5D Mark IV has an awesome 30.4-megapixel full frame
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  • does canon 5d mark iii have wifi