His range consists off 99 6x and bd flush draws Like AT,AQ and Possibly AK,JJ aswell if he does not like to 4-bet them. Rest is bluffs/Missed draws he is pretty polarized. I think its a weird spot not to raise 6x or mb a full house on the turn since you can have one off the flushdraws and you bet both streets and that indicates something(unless you are doing this often as a bluff). I agree with your call since his range is polarized here. 

Also is he a kind of player that just flats raises with KK,AA pre because if he is you have to consider that as his mid-range of that shove. If he is really creative he can also do that with A9 or something like AJ.

Btw what did he have? I want to know because I would also have called in your spot

I can´t help, but way too often I read statements like "meh, his range is polarized, I call!". A range of 9 nut-combos and one total air-combo is polarized as well, yet you only have 10% equity. How is that an argument? :)

We have to give him a real range and estimate our equity against that. We need ~36% and the very best I can come up with is 40% - against a really lose calling / bluffing-range, so I´d say a call is not "bad", but it´s by far no no-brainer, it´s pretty damn close.

he had K4 ins spades