Yuming do huge concerts but I think they're extremely boring since she does NOTHING. Like, all stunts happen AROUND her while she just stands there, singing, you know? She barely even moves. It's like she's suffocated by all the stunts. In my opinion, it's not as good as Ayu concerts. It's a bit like going to Cirque du Soleil, not to a REAL concert. I don't know, after hearing so many great things about her shows, I was extremely underwhelmed when I finally watched it. It's BORING (and this is coming from someone who LOVES effects, amazing set designs, etc). But no question they are
amazing visually.
For me, "Utada United" worked better than most Yumi Matsutoya concerts I've seen. Hikki just stood there singing while lots of cool images were projected around her but I didn't feel she was overshadowed by the big production like Yumi. But Utada's concert DO get boring after awhile if you're not a big fan of her music, so I don't think it compares to Ayu either.
Koda Kumi do huge concerts too but I don't know, in my honest opinion, they look extremely TACKY. Everything looks expensive but ew, such bad taste (to the point where some expensive effects look CHEAP).
There's also MISIA. She does huge concerts full of effects, etc. Her concerts are easily available on Youtube I think (at least, they were). Again, I was not very impressed but they're also huge.
I used to LOVE Ayumi concerts with all my heart. They were always amazing and very interesting. Until My Story, most of them were very good (except for the Countdowns which I never particularly liked), then (miss)understood was nice and, with Secret, things started to go downhill, it started being boring and repetitive. It's such a shame they repeat the exact same pattern year after year, to me this is quite bad for someone who was once known as a "chameleon" and it really is a proof of how quality has gone downhill in her career (in my opinion obviously)...
But, overall, most popular Japanese artists have big productions: Exile, Johnny's artists, Mr. Children, GACKT, Seiko Matsuda. Neither of those impressed me as much as Ayu did with her earlier concerts but you could give it a try...
By the way, like you, I'm also a HUGE fan of big productions and big concerts, I've seen plenty (and it's hard to impress me) and can I give you a suggestion that has nothing to do with Asian artists? Take That. I hate boybands but one day I accidentally started watching their concert DVD and I've never seen anything so impressive (and I've seen Madonna, Britney, Mylene Farmer, U2 and the Rolling Stones LIVE).
Here is the complete concert and I REALLY recommend it for anyone who appreciates big concerts. It's simply breath-taking and they're amazing performers.
This is one of the most amazing visual effects I've ever seen and
this is also amazing.