Yoga 920 or c930? UHD or FHD? Etc.

I'm looking to replace a Macbook Pro Retina 2013 right now. The primary purpose is notetaking and student work.

1. Will getting a Yoga with FHD be a bad enough downgrade from retina display to warrant getting a UHD?
2. Is a Lenovo Yoga 920 8gb UHD offered, or is it strongly recommended/necessary to have 16gb with UHD?
3. How do I figure out if the c930 is worth it? I know the battery life is an hour shorter than the 920. I feel like the rest comes down to little details, but the difference is only $50. Which is better for my purpose?

 

I have a 920/8gb/256gb/FHD which I'm quite fond of, but I feel I cheaped out a bit on the specs as I went with the base model.

FHD looks great on a 13-inch screen, but UHD is nicer - no two ways about that.

As the 920 is discontinued where I live, it's C930 next for me, but I'd probably would've went that way anyway (the wife will put my 920 to good use).

EDIT: I actually changed my mind and got a base model C930 with the same spec as my base 920. I have no problem at all recommending the C930 over the 920 - it's a great laptop! I tried ALL main competitors and none of them are even close to Lenovos QC.