No its not G3D, but honestly, for distant open world outdoor games like this and many others, it really makes very little difference. G3D is best for close quarters games. I would probably play it in Z3D anyways just due to the extra performance and lack of other issues G3D brings (shadows, etc) to many games.
Not trying to change anyone’s opinion on G3D vs. Z3D, but for third person outdoor games like this one I strongly agree with dborosev’s post. Provided you aren’t after unrealistic over-the-top ‘dollhouse’ stereo 3D, in this type of game you rarely will encounter situations where you look at objects close enough for G3D being any better than Z3D in terms of the produced 3D effect. So in this particular case (and similar outdoor games) the performance benefits of Z3D indeed outweigh its disadvantages IMO.