Only at tradeshows. But they are so different, that I a bit puzzled by what makes you so divided. Either you have use for an integrated drum machine and the DJ808 is your weapon of choice or you don’t and then buying a controller with a built-in drum machine makes no sense as you are paying for something you won’t be using.
And there is a whopping price difference as well.
So if drum machines are not your thing, save your money and go SX2. If you have the budget and a drum machine is a must-have for you, then go Roland.
Just my 3 cents as usual.