The G70 3.3T is freaking awesome! I only took it for a brief drive and I love the way it drives! It is firm without being punishing, the steering is tight in sport mode and almost feels like it's hydraulic. Drivability is similar, easy on start but even in comfort a little bit more effort gets you going while the Stinger would require a bit more. The comfort mode feels like like sport, not a huge difference, similar to how the Stinger's sport is not far off from comfort but to a lesser extent than the G70. My take on this, the G70 should have the Stinger's comfort mode and the the Stinger's Sport mode should what the Genesis has on comfort. Now I'm curious to know if the springs and shocks are different or if it just the tuning of the shocks. This reminds me of a 335, I drove back in 2010 how buttoned down it is. I'm smitten!
On the downside, the space is tight in the back and the trunk small, but we all know about that already. That's the main stand out negative for me. Material quality is good, sound isolation is excellent, so much so the audio system rocks at a setting of 10. The Stinger needs better glass to seal out noise. I'm going back to do a proper drive on Saturday and get some numbers.