Diagonal cut is only acceptable for a grilled cheese or Philly style sandwich. All others should be cut square.
A thrown together ham sandwich like this has no business being cut. This sandwich is all business. A soggy ham sandwich's only place in a civilized society is "oh **** you have a field trip today."
There's no sense in dressing up this pig with a slice, just shove it into your face as quickly as possible and consider it the low point of your day.