I like the Tanager shots. The color looks right. Like the Sting Ray shots too. The first one features red that also looks (to my eye) very good, but the second shot of the entire vehicle (the red) looks a little orange-ish. I'm no color expert but a successful commercial photographer friend told me recently that, in his experience, Nikon (sensors, algorithms etc.) yield better reds than Canon and neither as good as his Hasselblad system.
I do agree that red is often a challenge, especially along the path that leads to a best quality print. Here is an example of some intense red flooding my Canon 1D series sensor: