The newer Corsair CX series with 5 yrs warranty is still a tier below Seasonic S12II. The Antec EAxxxG series doesn't compete either.
seasonic si2ii has been degraded to tier 4 on linustechtips tier list.. as it does not have UVP on 12v rail, no OCP and no OTP , group regulated design , 8 years old..
PSU Tier List Updated
the only good thing it has are japanese caps and FDB fan..
the new corsair CX (not M) made by CWT ( Cx has 2 oem other is great wall ) is very good and is better than seasonic s12ii
DC-DC , good performance , all protections.. excellent price if you can get this for 3300 , rifle fan only 2 or 3 samxon/suscon/elite caps rest mostly are solid caps..
*club.dns-shop.ru/hardware/Обзор-и-тестирование-блока-питания-Corsair-CX650/
Corsair CXM and great wall CX can be argued which is better compared to seasonic depending upon what you value most.. caps vs performance + protection/safety