Should I upgrade my Panasonic G5 body?

I've had my Panasonic G5 body for a while and have taken many great pictures with it. My lens kit is decent, (20mm f1.7, 12-35 f2.8, 35-100 f2.8, 100-300 f4-5.6) and I have the 100-400 f4-5.6 on pre-order.

My question is there any leap in value to upgrading the body to say the G7 or GX7 or GX8 or GH3 or GH4?

I shoot very little video and shoot almost exclusively wildlife and landscapes here in NW Wyoming.