Anyone with a Genesis Croix de Fer 2016 pls help

I don't think many would own a CdF 2016 (given the price...) but I am actually thinking of buying one, I am not sure about the sizing though.
Since I want to keep an expensive seatpost (Canyon VCLS 2.0 leaf), which requires at least 15cm unclamped, could anyone with a CdF *2016* frame please let me know the distance from the seatclamp to the floor and the bike size (S, M, L etc.).
I don't live in the UK and there's no dealers in my country, so putting my hands on the bike is not an option.
Many thanks!
Since I want to keep an expensive seatpost (Canyon VCLS 2.0 leaf), which requires at least 15cm unclamped, could anyone with a CdF *2016* frame please let me know the distance from the seatclamp to the floor and the bike size (S, M, L etc.).
I don't live in the UK and there's no dealers in my country, so putting my hands on the bike is not an option.
Many thanks!
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http://www.genesisbikes.co.uk/bikes/adventure/multisport/croix-de-fer-20
Strava
PS, I have a 2015 Croix de fer 20. I think they only changed the colour for 2016. It's a size 54, I can measure it later if it helps?
Strava
Strava
seat tube length 540, top tube length 545 . The 2016 "M" - which should be a 54cm - has
seat tube length 530, top tube length 561.
Gotta love those dual-valve rims... never have to rotate the wheel to access the valve again...
Interesting crank arrangement too. Must be the cycling equivalent of swimming butterfly.