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Further tests for pinkness, but selecting -0.67 EV under exposure : -
^ Extremely rich colour on a very sunny day - This is what's to be expected from under exposure.
Colours are true though - Good greens, stonework, and white in flag. Pass.
^ Shot towards the sun and delivers excellent overall exposure (Pattern metering) and also the subtle building colours in shade are impressive. Pass.
^ Under exposure EV of -0.67 is an improvement but still too pink where lit by direct strong sunlight.
You can see the difference in the shady parts on the driver's door which aren't pink. Fail.
So my conclusion is that any tendency towards over exposure turns Tornado Red towards pink. I'll be testing -1.0 EV next.
One excellent feature of this camera is that you can see the effect on exposure on your composed photo as you revise the EV setting on the fly. It also displays your EV setting clearly. So it makes getting it right for the individual subject much easier.