JD750 wrote:
I love my 9-18 and use it a lot hiking in the mountains. I hadn't considered the 12-100 because typically optical qualities suffer with zooms ratios getting bigger than 5 or so, but seeing you and others here recommend it, I have to re-think that. And given OM systems modern approach to computational photography, the 5x zoom limit may be overly restrictive. Anyway I have added to my "want next" lenses list.
Try the Zeiss 24:1 zoom on the RX10m4 - it WILL change your outlook on high ratio zooms - at least in this one case ! Small sensors need at least f4 lenses.