Christmas Day is great no matter what day of the week it falls on. When it is Christmas Day the day is completely different to any normal day of the week, so whatever day it is doesn't really matter.
Christmas Day 2010 is a Saturday.
Christmas Day in 1940 was a Wednesday.
Christmas Day will be on a Sunday in 2011.
Christmas Day will be on a Wednesday in 2013.
Christmas Day in 1914 was on a Friday.
Christmas day will be on a Saturday in 2010.
Leap day does affect which day of the week Christmas falls on, but Christmas will always fall on the 25th. Hope this answered your question!
Christmas 2015 will be a Friday.
Christmas in 2001 was on a Tuesday.
Christmas will be on a Friday in 2054.
Christmas was on Friday in 2009.