Utility
The Nissan Sentra and the Mazda MAZDA6 can accommodate the same number of passengers.
Dimensions
The MAZDA6 is tremendously more bulky than the Nissan Sentra.
Your wallet will hurt more every time you fill up the MAZDA6 than the Nissan Sentra because of its bigger tank.
The Nissan Sentra and the Mazda MAZDA6 compete for the same parking spaces.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs about the same to get the Nissan to the dealership as the MAZDA6.
Regarding MSRP, the Nissan Sentra costs substantially less than the MAZDA6.
Drivetrain
The Mazda MAZDA6 has a more sizeable engine than the Nissan Sentra. Keep in mind that smaller engines typically get better gas mileage, but a smaller engine usually has to work a little harder.
Comfort
Taller drivers will considerably enjoy the extra head room in the Nissan Sentra's front cabin compared to the Mazda MAZDA6.
The ampler interior dimensions of the Mazda MAZDA6 make it substantially more spacious for your passengers than the Sentra.
Warranty
The MAZDA6 and the Nissan have the same basic after-sale protection.