Just got this guy for close to retail price. I am planning on having him stand in the cabinet behind my 1/6 Alien figures. He'll no doubt tower over them. I'd guess he'll compare to the size of the original Space Jockey and be only a bit taller than the original idea of the Engineer being 10' tall. Hope it'll look good...
Edit:
So the Space Jockey is 15', the Engineers in Prometheus is said to be 10' (though the height varies quite a lot by the look of it. The pilot suits hanging are at least 10').
If the statue was meant to be 1/6 he would be approximately 11' tall depending on how tall the base is.
Should be ok on display I hope...