I think it’s time you perform a more proper test between the lenses: five photos of the exact same thing, at the same time, with the same settings on the camera, but shooting with both lenses alternately.

We anxiously await your results.

Though it niggles me that there’s still a slight colour bias in the camera’s default mode. However, it seems to me that the effect isn’t anywhere near as pronounced as it was with the kit lens, and it does seem to be very much scene-dependent.

In fact, the more I look at examples such as the above pic it strikes me the effect’s quite “pretty”, and just about liveable with.
In that sense there are similarities to the GX10 which has a tendency to impart a rather pleasing (imo) blueish cast.