Default Performance of last year WP devices?

Considering the availability of snapdragon 800 devices (such as Lumia 1520), is a device like Lumia 920 (or HTC 8x) still powerful enough to handle all games and apps?

I'm thinking of getting a secondary windows phone. I wonder how last year's devices perform these days.
Good Bye XDA! These 5 years have been fun! See you again someday.
Phones: Touch 3G, HD2, HD7, Galaxy S, Sensation, Galaxy Nexus, One X, Nexus 4, Lumia 720, Htc One.
Tablets: Asus TF300T, Microsoft Surface, Asus Nexus 7 (LTE)