Love to hear your feedback at this first proper filming test in the new office 

Sound seems ok to me and definitely don't go 4K as Youtube will take an age to process your videos. Another UK reviewer went 4k and his videos are pretty short yet they take like 4 or 5 hours to process properly and hardly anyone has 4K anyway.
Looks good TTL and sound doesn't seem bad at all. I'm sure with some of the tips others have suggested it'll be spot on.
Love the nerd shelf behind you for all sorts of stuff
And as for the resolution stuff. Can you film in 1440? i've seen 1440 vids on youtube so that might be a good compromise as more and more people are moving to 1440p
You got the letters in the back wrong!
Really digging the new look. Esp the painted brick. Cant beat a bit of tessellation
My cam is 1080 and Ive not seen any 1440 varients yet :/