Although Japan is the country of origin for Gunpla, I still think that many work displayed in the recent ACGHK (Animation-Comic-Game Hong Kong), for the same competition Hong Kong category were more impressive. Models and dioramas there like the mini Gundam fan room, Haruhi Gundam, real-scale Shiba-I Sazabi and others caught my interest immediately. That's from a pure audience's point of view of course. The quality of the work done by both Japan and Hong Kong fans needs to be acknowledged nonetheless.
The Japanese seemed to be emphasizing more on the painting part for their entries.
Images from Dengeki Online.