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Mike,
My first thought was that it seems like a LOT of compression. Megabits? 1/8th of a Megabyte, so around 33MBPS?
Anyway, I've been doing UHD as downloads for 4 months and have tried many things.
Shooting with Sony and the XAVC S at 100MBPS setting.
Edit in Vegas. I render out as you have, Main Concept MP4 but closer to 50MBPS. Results OK but wouldn't play natively in my WMP.
I then tried sending out as XAVC S (which one forum claimed wouldn't recompress most footage). Then I took that file and sent through Handbrake, using X264 codec and MP4 results are decent. Plays fine in WMP.
As a test I took that same test file (XAVC S from Vegas) to my 4 year old iMac that has Final Cut X and Compressor. File would not import directly into Compressor. I put the file in Final Cut, then sent to Compressor. The final MP4 output from Compressor was visually better as compared to what came out of Handbrake - but remember, this process include a render from Vegas that I would prefer to avoid. In this test I manually adjusted the Compressor profile to have roughly same numbers as the Handbrake test. File size on HD was near the same.
As the last test I took the original footage, edited in Final Cut X and sent out to Compressor and that same Custom Profile. This final MP4 was the best of the bunch.
Like you - I don't have a 4K monitor, but the iMac has 2560 by 1440 resolution and I used Quicktime to just watch each file over and over, and had a friend do the same. The best files in my testing...
#1 The file created with full iMac workflow (Edit in Final Cut, render in Compressor). 2160p @ 50MBPS
#2 The file edited on Windows 7 machine with Vegas, rendered out as XAVC S, then moved to iMac and final MP4 made in Compressor.
Yes, I know that doesn't make any sense considering there is that extra render in #2, but its what we saw playing all versions of that test file on the iMac in Quicktime.
The test was 6 minutes, general video. Sky, Trees, a rabbit, blowing tree branches, cars passing by, etc.
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