ultrawide monitor resolution question

Hi,

I’m about to be purchasing a new 21:9 curved monitor strictly to use as my zwift display.

It seems all the monitors out right now that are 34’’ are either 2560x1080, or 3440 x 1440.

My current computer will run the ultra setting just fine on the standard 1080 display.  (using the zwiftalizer) website. 

My question is this… does zwift support 3440 x 1440 (4K) to the point where i would see a difference compared to a 2560x1080 display?  

I’ve done some digging online and cant seem to find any comparisons.

Thanks in advance.