Was owner of a BMW 523i F10 .. tested the different makes, eg. Audi A6 2.0T, Jaguar XF 3.0 V6, Infiniti M37 and Lexus GS variants (diff days; 6 hrs at least in total) .. finally chosen the GS 350 F Sport.
Felt the BMW was a quieter ride (after some light tune) even when stressed as compared to the new sporty GS, it was also faster than the GS250 off the line, as the in line 6 delivers power instantaneously. However, the GS is easier to handle and relaxing to drive .. esp with the new suspension setup, it's easier on my bones when going over road humps and with the F Sport "sport +" on, going around bends is a breeze. The specs from "premium" are also much better than my stock BMW. If you just need a comfortable ride and good specs, the GS250 "premium" will do just fine .. some aftermarket light tune will make it more responsive. For me, the GS250 will not be able to tempt me over from my BMW .. Now, I am a happy owner of the GS350 F Sport .. the power and engine/exhaust with "sport +" on .. is addictive !
Have been driving the car for more than 3 months now .. choice of luxurious comfort or sporty drive at the twist of a knob .. handling of the car is fantastic .. power without control is useless and Lexus has done well in this aspect with the "sport +" mode.
This is definitely a more comfortable and an easier car to drive than my 523i F10, though of course I would not be comparing apple to apple. The car has 2 extreme personalities that catered to my needs very well, eco mode for weekday driving and sport + for the weekends .. bcos I shared the car with my wife and I drive more over weekends. Problem free so far except for the occasional screeching of brakes which I do hv such sound from my 523i previously .. but since Lexus pride itself as in pursuit of perfection .. sent in and problem resolved with changing of brake disc and pads free. As for car performance .. The 316 hp esp in sport + and occasional peddle down is more than enough to meet my sporty driving, which the 523i was a little lacking. The pipe-in engine sound has also reduced with a bottle of ceratec .. in fact , I would use manual shift at times to hold the gear longer or i will rev harder in the eco mode to enjoy the Yamaha tuned engine/exhaust note .. love it better than the mark levinson sound system.
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Getting slightly more than 10km/l. The fuel consumption for the GS 350 F Sport is almost comparable to my previous 523i F10, unless you pushed it real hard in the Sport+ mode. Reading shows can travel more than 600km for a full tank.
I read something abt the car having dual injection of petrol .. the direct injection at higher speed actaully gives good fuel consumption. The bottle of liquid moli ceratec may have also helped .. as I find the engine at idle is also quieter.
So far happy with me new ride : )