I've found cyans and semis in an equal number of patches and probably totaling equal quantities. The difference is to find semis I've spent hours going out of my way traipsing through muddy fields, avoiding being seen and getting wet and cold, normally without fruits. Cyans I just look in every planter I go past as I go about my autumn/winter. And cyan finds are normally much denser. For me they're already at least joint top active mushroom in the UK. I think it largely depends where you are. Wales and the North are semi strongholds, but the south has never produced as many, and with the invasion of cyans (apparently from imported plants via Kew) I think they will inevitably surpass semis down here.