Just finished the game. Honestly a great one.
That final fight against Ultima was pretty spectacular, especially the arena for Ultima Risen. Easily one of the best arenas. Music is not on the level as One-Winged Angel, Dancing Mad or Almighty Bhunivelze but it was pretty badass to.
In general, I loved the game. Great graphics, most of the characters are very charismatic and easy to like, particulary Jill, Mid, Hab, Cid and Byron. Clive is an excellent protagonists, easily one of the most badass and very likeable. Music is top notch, some are among the best in the franchise, Find The Flame being THE best in the OST, with the music for Dominants, Bahamut and Titan Lost being close second. All Dominant/Eikon bosses are amazing, all worthy of being a final boss in another game, with Titan, Odin and Bahamut taking the cake. Ultima is a good antagonist, with a pretty creepy design (particulary the eyes) that really sell out how alien he is. I love that the story starts out as a "low" fantasy medieval GoT-like story but then completely shifts on itself with Ultima with much higher stakes.
My only complains would be that some characters are kind of wasted. Benedikta and Hugo notably are good but not really well used I think, particulary Hugo, he just comes of as an easily tricked brute. Emperor Sylvestre has an amazing design but like them he's reduced to a puppet for Annabella and I genuinely think he could have been used better, especially since aside from Mateus emperors in FF tend to be tossed aside as antagonists (FFVI and XV were guilty of this notably) and I think something else could have been done with giving him a greater role as an antagonist. Ultima is also good but not that memorable compared to older FF villains and I'd say Caius Ballad, Bhunivelze and Ardyn Izunia are much better. Another complain would be that you can't visit some pretty magnificent-looking locations. I just love the design for Oriflamme and I was very disappointed you can't visit the city. A minor one but I also think Jill could have had a greater role and more feats to her name. Cid could have also been there a bit longer even if he's really good (plus once again Ramuh get sidelined in the storyline). And as I said before, I wish we had more Eikons to add more variety in abilities, like Diabolos with gravity.
Overall, an excellent game, a solid 17/20 and I don't regret trying it in the slightest. I DO prefer FFVII and (ready for the beating) XV though but personal preferences.