Would you choose X-T20 + 18-55 over X-T10 + 15-45 + 35/2?

Emploia wrote:

...but I already feel like this is a big step for me (in comparison to GX80) and I'm waiting for XC 35mm F/2 release

First Fuji incoming, so happy about it! If I bought X-T1, I'd be still thinking about X-T20/X-

Actually, if you've learned most of the functions of the GX80, the X-T20 won't be all that big a step up as far as how sophisticated the body is to use.  Certainly it is a different approach to mode dials, but some people may actually find the Fuji approach to be more simple.  I assume you wouldn't worry about a "step up" in sensor or continuous auto focus performance.  Single servo AF on the Panasonic is about as good as you'll find, and my Fuji's certainly don't seem any faster or more accurate in that regard.

The biggest differences between the x-t20 and your GX80 will be in high ISO noise, improved dynamic range and out of camera JPEG colors.  There are plenty of color modes to pic from on the Fuji, but that's just a matter of trying a variety of settings and picking what you like best.  I definitely would not be concerned about it being too big a step.

If you take the time to do a little testing of the film simulations and get the C button's menus set up to your preferences, then the Fuji is quite easy to work with after that.

I'd much rather have the performance improvements of the x-t20 over the x-t10.  That said, if you don't crop much or print large enough to warrant the increase in megapixels and you don't need the AF improvements, then you can certainly get great images out of the x-t10.  I have an x-e2s (16mp sensor) that I enjoy a lot.