Yes, there is a better image due to the stronger processor.
We are talking about improved shadow details, i.e. dark zones.

In addition, unofficial firmware support is guaranteed for the C models and upwards. This means that you will receive updates for the device for longer.

Panel all have the same thing.

The B9 has a smaller processor (Alpha 7 Gen2) whereas the C9 and E9 have the Alpha 9 Gen2. However, I don't know if this is noticeable.

In addition, the E9 has a "Picture on Glass Design" compared to the C9 and an integrated sound bar with 4.2 channels and 60 watts for better sound.