Well, the fact that the pores are specifically Luke's isn't the important part :-)
That's what I love the most about HD, how you can actually see these minute details on people's skin and then also fabrics and such - I find it fascinating and it gives a whole new dimension of reality to the viewing for me - whenever I compare some screenshots of different releases of movies over at caps-a-holic.com (and I do that often, when I'm trying to decide which release of a movie to buy or whether to not buy it at all if a clearly superior master isn't available in my country), I always go for details of people's faces, as these are always the most revealing as to which master is superior.