All these configurations have been done during On-Boarding and discovery with my customer as the DSM.

Hello ..yes it does support 1080P. Please let me know if the link below helps.https://help.webex.com/en-us/article/xk37so/Enable-live-streaming-in-Webex-Meetings-and-Webex-Events

Hello You Are correct 4 Languages  by default but up 13 total spoken languages and 100+ caption languages.