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Yes, Proton Saga has Interior Lighting, which are: 2019 Proton Saga 1.3L Standard MT, 2019 Proton Saga 1.3L Premium AT, 2018 Proton Saga 1.3 Standard MT, 2018 Proton Saga 1.3 Standard CVT, 2018 Proton Saga 1.3 Executive CVT, 2018 Proton Saga 1.3 Premium CVT.

Here are the Power Socket and variants of Proton Saga:

Here are the Electronic Stability Control(ESC) and variants of Proton Saga:

The Bezza is better in terms of fuel economy, boot space and safety features.
The Saga is better in terms of ride and comfort.  

Here are the Auto Start/Stop and variants of Proton Saga:

Here are the Seat Features(Front-Driver) and variants of Proton Saga:

Yes, Proton Saga has Seatbelt Reminder, which are: 2018 Proton Saga 1.3 Standard MT, 2018 Proton Saga 1.3 Standard CVT, 2018 Proton Saga 1.3 Executive CVT, 2018 Proton Saga 1.3 Premium CVT.

No, Proton Saga doesn't have Sound Plus Functions.

Here are the Transmission and variants of Proton Saga:

Here are the Rear Airbags and variants of Proton Saga: