One of my students bought a 620x 2 years ago on a close out and the guitar was fine overall. Some Ibanezes can be lemons, especially if you get them from Guitar Center.But generally, good retailers stock better guitars.
The piezo (double Edge) system is the smae as it is in the 2020x and the sound quality is nice. I've compared the double edge sound to the Music Man
Petrucci model piezos nad the Double Edge sounds a little fuller.
The only thing I dont' know is if the 1620x has a
scarf joint or not. Otherwise, it should be the same guitar as the old 620x