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 Q60Get Your Price||2014 Audi TTBrowse Used Listings||2014 Mercedes-Benz SLK ClassBrowse Used Listings||2014 Porsche BoxsterBrowse Used Listings|
|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|
|Intercooled Turbo Premium Unleaded I-4||N/A||Intercooled Turbo Premium Unleaded I-4||Intercooled Turbo Premium Unleaded I-4||Premium Unleaded H-6|
|2-Door Roadster sDrive28i||Red Sport 400 AWD||2-Door Coupe S tronic quattro 2.0T||2-Door Roadster SLK 250||2-Door Roadster|
|Rear Wheel Drive||N/A||All Wheel Drive||Rear Wheel Drive||Rear Wheel Drive|
|Manual w/OD||N/A||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|