The Audi A4 is most often compared to other German luxury sedans including the Mercedes-Benz C Class and BMW 3-Series.
The Audi is more reserved than both, and lacks the gee-whiz tech found in the Benz or the blistering powertrains from the 3-Series.
Audi’s more conservative but keeps pace with both.
The Cadillac CT4 is new and we haven’t yet driven it.
The current Lexus IS is on its way out, and will be replaced by a new version so discounts should be plentiful.
The Alfa is unloved—and a little catawampus inside, if we’re honest—but a blast to drive.
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 2021 Audi A4Browse Used Listings |  2021 BMW 3-SeriesBrowse Used Listings |  2021 Cadillac CT4Browse Used Listings |  2021 Lexus ISBrowse Used Listings |  2021 Mercedes-Benz C ClassBrowse Used Listings |  2021 Alfa Romeo GiuliaBrowse Used Listings |
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| Quick Specs | |||||
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The 2021 Audi A4 blends a conservative luxury compact car with spicy performance and robust wagon flavors. |
The flexible 2021 BMW 3-Series lineup offers something for everyone, so long as they’re not smitten with SUVs. |
The 2021 Cadillac CT4 is well-equipped and fun to drive, making it a good small sedan choice. |
The 2021 Lexus IS doesn’t gain any ground on the more performance-oriented compact sedans, but it’s priced right. |
Svelte, sporty, and somewhat understated, the 2021 Mercedes-Benz C-Class should be at the top of your compact luxury sedan shopping list. |
Quick and sexy, the 2021 Alfa Romeo Giulia is an appealing Italian take on the sport sedan. |
| MSRP From | |||||
| $39,100 | $41,250 | $33,395 | $39,050 | $41,600 | $40,350 |
| Gas Mileage | |||||
| 20 MPG City / 31 MPG Hwy | 16 MPG City / 36 MPG Hwy | 20 MPG City / 34 MPG Hwy | 19 MPG City / 31 MPG Hwy | 17 MPG City / 35 MPG Hwy | 17 MPG City / 33 MPG Hwy |
| Engine | |||||
| Intercooled Turbo Gas/Electric I-4 | Intercooled Turbo Premium Unleaded I-4 | Turbocharged I4 | Intercooled Turbo Premium Unleaded I-4 | Intercooled Turbo Premium Unleaded I-4 | Intercooled Turbo Premium Unleaded I-4 |
| EPA Class | |||||
| Compact Cars | Compact Cars | Compact Cars | Compact Cars | Compact Cars | Midsize Cars |
| Style Name | |||||
| Premium 40 TFSI quattro | 330i Sedan | 4-Door Sedan Luxury | IS 300 RWD | C 300 Sedan | RWD |
| Drivetrain | |||||
| All Wheel Drive | Rear Wheel Drive | Rear Wheel Drive | Rear Wheel Drive | Rear Wheel Drive | Rear Wheel Drive |
| Passenger Capacity | |||||
| 5 | 5 | 5 | 5 | 5 | 5 |
| Passenger Doors | |||||
| N/A | N/A | 4 | N/A | N/A | N/A |
| Body Style | |||||
| quattro Sedan | Sedan | Sedan | Sedan | Sedan | Sedan |
| Transmission | |||||
| Auto-Shift Manual w/OD | Automatic w/OD | Automatic | Automatic w/OD | Automatic w/OD | Automatic w/OD |
| Detailed Spec Comparison | |||||
| 2021 Audi A4 vs. 2021 BMW 3-Series | 2021 Audi A4 vs. 2021 Cadillac CT4 | 2021 Audi A4 vs. 2021 Lexus IS | 2021 Audi A4 vs. 2021 Mercedes-Benz C Class | 2021 Audi A4 vs. 2021 Alfa Romeo Giulia | |
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