Zeiss Gavia was underwhelming for me for the price. I ended up trading it in to build a set of Kowa 66s and have no regrets.
I've spent some time behind the s series and the x series but only the 80/85. There was really no comparison between the x and the gavia, its a few leaps ahead. The s was a closer comparison but I would say the swaro came out on top in almost every scenario. Build quality will also easily go to swarovski over zeiss's conquest line.