The figure below shows colour interpretation as measured by Imatest on the P45+ using Capture 1 (7.1.3). It shows that greens are shifted towards yellows, and this is very visible in landscape shots:
The image below shows my A99-SLT with a profile made by Adobe DNG Profile editor:
I know that Digital Transitions has a department working on repro-photography, and I recall reading they could get DeltaE around 2.0 with an IQ 280 (?) on the test chart they use. Accurate is not pleasant, but reproducing the sixteen colours that happen to be to the standard reference point in the industry is a good starting point. Those colours were chosen for a reason.
On the other hand, Adobe Standard profile yielded Delta E = 5.65, a lot better than Capture One, but the Adobe standard profile was not acceptable to me on the P45+.
One of the most important aspects is white balance, the images below are identical, and the same surface was used for WB, but on left one the sunlit part was used while on the right one the shadow part was used for WB. I guess that getting WB right is extremely important for colour rendition.