^
Guy Gavriel Kay is certainly epic in scope. Most of his fantasies are thinly-veiled takes on real life history, tending to focus on pivotal events and personalities.
I'm not sure how over-descriptive they might be considered, since he does tend to go on narrative tangents telling the entire future of some minor character who has a brief but life-changing encounter with the leads. But IIRC he isn't quite as fond of expository infodump as many other sfnal writers. Generally when he describes something, ISTR it tends to serve an immediate storytelling purpose to keep a plot/character development thread going or explain some scene-relevant worldbuilding. YMMV.
If it's any help to the OP, apparently GGK got his start as a fantasy author helping out Christopher Tolkien do some stuff with J. R. R. Tolkien's literary estate, so if they enjoyed The Hobbit/LOTR, they might wish to give him a try.
Out of the ones I've read, I'd personally recommend as the best bets for their criteria:
- The Lions of Al-Rassan, loosely based on the Spanish legend of El Cid. IMHO, the best one he's written to date.
- The Sarantine Mosaic duology, comprising Sailing to Sarantium and Lord of Emperors, set in a Byzantium analogue during the reign of expy Justinian and Theodora. Also very good, and possibly second best work, quality-wise.
- The Last Light of the Sun, expy Viking-invaded Anglo-Saxon Danelaw under faux-King Alfred the Great. Actually not one of his better books, quality-wise, IMHO, but still a reasonably solid story with plenty of action in it. This might be of greater potential interest if one likes Bernard Cornwell's The Last Kingdom series and wants to read a fantasy take.
Those are the ones I recall as having the most action and highest stakes to their plots, with impending or ongoing wars and other conflicts about to come into the open.
Also possible, but perhaps less to the OP's taste:
- A Song for Arbonne, political intrigue, loosely based on Queen Eleanor of Aquitaine's Courts of Love. I actually rather like this one and would consider it my personal favourite of his works, and Wikipedia says it was an Aurora Award winner. But it seems to be one of his less popular books, so I think it may be an acquired taste.
- Tigana, grand sweeping high stakes epic which is Renaissance Italy-ish, about the survivors of a conquered and magically-deleted city-state banding together to obtain revenge for the irrepairable destruction of their homeland. It's one of his earliest books and his writing has improved since then. In retrospect, this one feels somewhat bloated and meandering in comparison to his later novels.