Thank you for your answer. My perception between EX1000 and Kanas Pro is almost same with your perception between EX1000 to Oxygen. and combined with statement from
@IryxBRO, it match that Oxygen have similar sound signature with Kanas Pro, and from what i get, they have better bass compared to Kanas Pro.
So Oxygen is like slight refinement to Kanas Pro, better bass texture and extension, and darker a bit from Kanas Pro, and maybe more open sounding / has bigger soundstage (yet to be confirmed again) but I don't think its worth for me, at least for now since I already have Kanas Pro and EX1000.
For those who doesnt have one of them, you can get Kanas Pro for $160-180 or this great Oxygen for $270