A decade ago, BMW and Mercedes-Benz has gone to six-cylinder base engines for their roadsters; now with better engine technology—especially turbocharging—they're returning to fours.
The Porsche Boxster stands as the most serious sports car in the group, and it's probably the top choice for those who also plan to take their car out on the track once in a while; the only disadvantage of the Porsche is that you get a little more interior noise.
The Infiniti Q60 is also at the portly end of the scale, although its strong V-6 is an asset.
The Audi TT is more of a sports car in its current generation and is a lean-feeling alternative that costs less.
Like the Z4 28i, the Mercedes-Benz SLK 250 offers strong fuel economy, although the SLK tends to feel a bit bulkier.
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 2014 BMW Z4Browse Used Listings |  2018 INFINITI Q60Browse Used Listings |  2014 Audi TTBrowse Used Listings |  2014 Mercedes-Benz SLK ClassBrowse Used Listings |  2014 Porsche BoxsterBrowse Used Listings |
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| Quick Specs | ||||
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The 2014 BMW Z4 offers a pleasant balance of luxury, comfort, and sport, but it is at the pricier end of the roadster spectrum. |
The 2018 Infiniti Q60 is a luxury coupe with a knockout one-two: devastating shape and savage performance in top trims. |
The 2014 Audi TT is quick, fun, and stylish--but don't expect to bring the family along for the ride. |
The 2014 Mercedes-Benz SLK is the most conservative choice amongst its competitors, but the mini-SL makes for a charming, compelling choice. |
The 2014 Porsche Boxster defines the luxury sports roadster segment with its power, grace, and style. |
| MSRP From | ||||
| $48,950 | $39,950 | $39,900 | $43,525 | $50,400 |
| Gas Mileage | ||||
| 17 MPG City / 34 MPG Hwy | 19 MPG City / 30 MPG Hwy | 22 MPG City / 31 MPG Hwy | 19 MPG City / 32 MPG Hwy | 20 MPG City / 30 MPG Hwy |
| Engine | ||||
| Intercooled Turbo Premium Unleaded I-4 | Intercooled Turbo Premium Unleaded I-4 | Intercooled Turbo Premium Unleaded I-4 | Intercooled Turbo Premium Unleaded I-4 | Premium Unleaded H-6 |
| EPA Class | ||||
| Two Seaters | Subcompact Cars | Subcompact Cars | Two Seaters | Two Seaters |
| Style Name | ||||
| 2-Door Roadster sDrive28i | 2.0t PURE RWD | 2-Door Coupe S tronic quattro 2.0T | 2-Door Roadster SLK 250 | 2-Door Roadster |
| Drivetrain | ||||
| Rear Wheel Drive | Rear Wheel Drive | All Wheel Drive | Rear Wheel Drive | Rear Wheel Drive |
| Passenger Capacity | ||||
| 2 | 4 | 4 | 2 | 2 |
| Passenger Doors | ||||
| N/A | N/A | N/A | N/A | N/A |
| Body Style | ||||
| Roadster | Coupe | quattro Coupe | Roadster | Convertible |
| Transmission | ||||
| Manual w/OD | Automatic w/OD | Auto-Shift Manual w/OD | Manual w/OD | Manual w/OD |
| Detailed Spec Comparison | ||||
| 2014 BMW Z4 vs. 2018 INFINITI Q60 | 2014 BMW Z4 vs. 2014 Audi TT | 2014 BMW Z4 vs. 2014 Mercedes-Benz SLK Class | 2014 BMW Z4 vs. 2014 Porsche Boxster | |
