I have a MOTIF 6 61 keys and it felt like the MOXF6 keys when I played it at my local guitar center. synth like feel to the keyboard, nice and responsive. I picked the MOXF8 88 keys mostly cause I needed the extra keys but the MOXF8 has a slightly tighter feel to the keybed, not weighted or semi weighted just tighter or springier.
in comparison the Korg Krome 61 key I tried felt like a toys-r-us $50 toy keyboard. the keys were horrible. the MOXF6 61 keyboard felt like a responsive synth keyboard which fit my playing style and didn't hurt my hands from playing.
I played a Roland FA8 88 keyboard and felt different in a bad way, I like the Yamaha 88 keyboard better.
Roland FA6 61 keyboard and the Yamaha MOXF6 both felt sort of similar in the keybed, synth like, not weighted or semi weighted at all, both responsive. I still might buy a Roland FA6 for sounds but thinking I might buy the Integra 7 instead so no need for yet another keyboard - and I have the MOXF8 so.
Roland FA6 61 keyboard or Yamaha MOXF6 are very similar in features, just different sounds. you could pick either one and be happy.