Here’s a great video from Linus Tech Tips that gives some insight to the 1080p/4K debate and some practical considerations for shooting, editing and exporting in one over the other. It pays particular attention to online video use (and specifically with regard to YouTube videos) and how they use the Panasonic GH4 and Sony FS700 as 4K shooting options.
I have been a proponent of shooting 4K and editing in a 1080p timeline to afford additional reframing options (or even 1080p footage in a 720p timeline if you are limited to HD cameras). The above video, however, makes the additional argument for 4K exports even if you are working in a 1080p timeline. That’s a new consideration for me but, given how YouTube treats 4K files, is certainly worth considering and testing in the future.
For those of you who shoot video, what format do you prefer to shoot, edit and export?