A few differences here. We'll refer to the $899 model as the Tribute and the $1,399 as the Standard.
Finish: The Tribute model offers a satin nitro cellulose finish which is less time intensive (and less expensive) than the high gloss nitro cellulose finish of the studio Standard.
Electronics: The Standard sports full size humbuckers with push-pull pots for coil tapping, not offered on the tribute model. The Tribute has mini-humbuckers (similar to the Firebird and Les Paul deluxe models from the 60s and 70s) with no coil tapping
Case: Lastly the Standard comes with a hard shell case ($199 value) and the tribute ships with a gig bag.
If you're looking for a great value priced guitar and the points above aren't an issue, the Tribute model would be a fine choice!