I thought about getting one of those specifically for video editing, but I would have gotten the 256gb SSD instead, since I keep all my media on 5TB external drives and only need the operating system and apps on the internal drive. At that time, this configuration was selling for $1400, which seemed like a lot considering the GeekBench score. However it looks like a nice machine and I'm sure it could handle your needs.
I ended up getting a used 2012 i7 2.6ghz quad mini with 16gb and original Apple 256gb ssd from OWC with 3 month warranty/15 day return period. It was $150 cheaper than the 2014 top end model and (more important for me) about 50% faster for CPU intensive tasks like rendering. That is pretty significant when I have a 12 hour render on the 2012 quad, it would take 6 hours longer on the 2014 3 ghz model.
The downside of the 2012 machine is, of course, it's not new and doesn't have a full year warranty with ability to add AppleCare. And the HD4000 graphics chip would be a limitation for some new software (although FCP still supports all the way back to the HD3000). The internal SSD will be a little faster on the 2014 model and it has two thunderbolt 2 ports plus the much faster 802.11ac wifi.
Now my machine is on gigabit ethernet, so I don't care about wifi. I like having the firewire port for my DVCAM/HDV tape deck. I'm still using legacy FCP, so a newer graphics card wouldn't make any difference, and I also have thousands of dollars worth of other legacy software that benefits from the ability to run MacOSX 10.8.5.
So my own needs are rather specific, and I thought the 2012 quad fit them better. I suspect many other people would choose a machine like the 2014 that you are considering though. It's up to you.
