Smaller display than Epix 2

Does anybody have an idea why the display of the Mark 2 series is 1.2 inch 390x390 pixel vs. 1.3 inch 416x416 pixel on the Epix 2? 

Interestingly this is not mentioned at least in the test videos I saw so far. 

I personally would prefer a display without a gap to the bezel and not a smaller display for more than twice the price.