I love every pair of Mid-high leather boots I have ever purchased from Ecco.  I think they would fit a bit tight if you wore a 13.5 - Ecco sizing says Euro 47, US 13-13.5, but it's definitely not 13.5.  In fact, I accidentally purchased a pair in size 48, wore them, and didn't notice the larger size until months later!! The sole cushioning/comfort is exceptional.