Shimano mw80 winter boot sizing

I normally wear a size 46 MT90 Shimano boot but should I go up a size on the mw80 so I can wear thicker socks or is this boot a wider looser fit?
Orange Clockwork 2007
Orange 5 2007
Just bought 2008 P7 frame (Orange fan? Me!)
Cotic Soul
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Orange 5 2007
Just bought 2008 P7 frame (Orange fan? Me!)
Cotic Soul
Pace RC303
Marin Mount Vision 2005, for sale
Stumpy HT 2006, shite, sold
Kona Lava Dome fully rigid
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I am a size 11 normally , I have these boots in a 47
http://www.pinkbike.com/photo/1844919/
2012 Cube Ltd SL (the hardtail XC 26er)
2014 Lapierre Zesty TR 329 (the full-sus 29er)