It's not a proper comparison. They are not on the same level, at least in terms of price, and weight doesn't always reflect quality.
It's obvious that Corsair's will weigh more than Xion's, but it's still fun to look at the exact numbers.
Keep in mind that Xion's PSU has two non-modular cables, 24pin and 8 pin cpu. But with two cables attached, it still checks in 253 grams less than the HX1000i.
Just FYI, my Xion 1000w PSU was dead 2 days ago, after 10 months of use. I'm going to get it RMA'd while I still can.
Take out a little more from your pocket and get a quality PSU on your first try, you won't regret.