A decade ago, BMW moved to six-cylinder base engines to power its roadsters; now with better technology, it can accomplish the same–or more–power with turbocharged four-cylinders.
The Porsche Boxster is the sportiest competitor in the segment, and while you may deal with a little more interior noise, it's the best option for someone looking for occasional track use.
The Infiniti Q60 is comparatively bulky, but comes with a rear seat and a willing V-6 engine.
The Audi TT feels lean and sporty–and it costs less, too–but it comes standard with front-wheel drive and less power than the BMW.
There's also the Mercedes-Benz SLK 250, which feels bulkier than the Z4, but offers similarly frugal fuel economy numbers.
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 2015 BMW Z4Browse Used Listings |  2018 INFINITI Q60Browse Used Listings |  2015 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 2015 BMW Z4 is on the pricier side of the roadster segment, but it offers a nice blend of comfort, sport, and technology. |
The 2018 Infiniti Q60 is a luxury coupe with a knockout one-two: devastating shape and savage performance in top trims. |
The 2015 Audi TT is quick, fun, and stylish -- but it skips full sports-car credentials in favor of a little more practicality. |
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 | $40,350 | $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 | ||||
| 2015 BMW Z4 vs. 2018 INFINITI Q60 | 2015 BMW Z4 vs. 2015 Audi TT | 2015 BMW Z4 vs. 2014 Mercedes-Benz SLK Class | 2015 BMW Z4 vs. 2014 Porsche Boxster | |
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