I test drove a 2018 450h, as mentioned above, i'd assume this is what you're looking at if you've sold a 2020 Highlander. It was lovely to drive, the V6 was powerful enough in a car that size and then the electric batteries felt nice and refined around town. The car we test drove was a Takumi spec which had the cooled seat which felt really nice and absolutely loads of spec/space in the front.
The let down for me was the infotainment. Being a 2018 it was pre-facelift and the facelifted model was out of our budget. It was very dated and the screen was small and low res. Instead we dropped down to the NX and the infotainment etc is much better, the screen/mapping is much better and it's got Apple Carplay etc.
Like you i was looking at a new CX-5 but just didn't gel with it, the engine/gearbox felt lacking and there seemed to be too much lag between putting your foot down and anything happening. Surprisingly the Lexus CVT box is much more responsive.