Color rendering and detail will get better as the sensor size is larger (all things remaining equal). In other words, as long as the sensor is a good photo sensor, the larger it is, the more light is captured. This allows for more detail and better color separation and rendering.

One thing I’ve noticed with APS-C sensors is the poor performance of earth tones, especially in low light. Even a cloudy day can cause some problems.

Below are some examples comparing 100% crop of APS-C sensors, and Full Frame cameras.

APS-C 100% Crops

Fuji X-T5 (100% crop)

Fuji X-100VI (100% Crop)

Canon EOS R7 (100% Crop)

Full Frame Cameras

Nikon ZF (100% Crop)

Source: https://www.dpreview.com/sample-galleries/0261659899/nikon-zf-review-samples/1037303440

Canon 5DIV (100% Crop)

Source: https://www.dpreview.com/reviews/canon-eos-r7-review#SG

Sigma FP (100% Crop)

Source: https://www.dpreview.com/sample-galleries/0600752649/sigma-fp-sample-photos/6009195192

Lumix S9 (100% Crop)

Source: https://www.dpreview.com/sample-galleries/3709998915/panasonic-s9-pre-production-sample-gallery/6469136585

Lumix S9 (100% Crop), Source: Me