Getting in/out of the 6 is difficult than other sedans as you have to bend quite a bit, I didn't think much about it until I tore my hamstring.
I can tell the 3 from the 6, the rear end of the 3 sedan looks ugly like it's chopped in half.
I know looks are very subjective but to my eyes except for the Mazda6 and perhaps the CX9, rest of their lineup looks pretty conservative and plain. The Mazda 3 in its sedan form has to be the ugly duckling of the family with a rather gaudy grille and a rear that looks like an afterthought. Hated how CX5 looked from the front as well until they designed it and made it a bit more subtle and easy on eyes.
If these spy shots of 2019 mazda3 are anything to go by then its a huge improvement over the current generation mazda3 in my opinion.