a7CII is most compact, while a7IV is the most powerful. For me to choose, I will get a7CII, or just wait a7v.
The Ninja V is one of the best choices for FX30.
If you are looking for a high-end 50mm prime lens, the new released Sigma 50mm f/1.2 DG DN Art lens is the best choice.
finally, only less a month for the official announcement, wish ZV-E10 II will have some good news.