I was out test driving the CX-30 Skyactiv-G (122hp) with auto transmission a few days ago.
The engine is a bit sluggish compared to my current CX-30 (with 120hp and auto transmission) but it was driving fine.
The car it self is miles ahead of the CX-3.
The interior is extremely nice and quiet, the seats are excellent and it's well build, so a very premium feel.
It was very easy to find a good driving position (it had electric seats). Every control is basically like in previous models, so everything worked as I'm used to.
The infotainment system is a huge improvement, quicker, better resolution and the menus are a bit different but not much (mostly they are vertical now instead of hoizontal).
Overall an excellent car and I'm very hooked on changing my CX-3 for CX-30 but I would go for the Skyactiv-X, even though it's a bit more expensive (though here in Denmark we get the fully adaptive LED headlights with the Sky-X, so that helps with the higher price a bit).
And it looks better irl than in pictures.