Cables make no difference, dude is just trying to sell you an expensive cable.
Load of BS if I've ever seen one.
As for standards, all HD standards are 60 Hz, that's the issue probably, 50 Hz is doable if the console and the TV supports it but it's kind of a bastard thing, nothing obliges them to support it in order to adhere to any standard - whereas they need to support 60 Hz in order to comply to any HD standard.That's a pretty narrow way to look at it.
Of course 120 Hz is better but every tv out there is 60 Hz in regards to input and if you don't want any motion enhancements going on (as is often the case for gaming, low input lag=tv doing nothing to the image) you're gonna have the TV just repeating a frame twice at 120 Hz. For still images there's no difference, for motion sans intermediate results there might be - but it's due to the panel response capability.
The real benefit of 120 Hz being that a frame internally takes 8.3 ms before being flushed (I'll call it half frame in a while) rather than 16.7 ms (16.7 being the time a frame takes up @ 60 hz) and with things like motion compensation going on it means you can kickstart some of the time it changes to fixate the color or a transition by a whole "half frame" by initiating a transition ahead of time (this kickstart means intermediate results and more input lag though so in actuality it's not ahead of time but slighly behind). Anyway you get the gist of it.
Way more important than that is ghosting time, the lower the better, and nothing stops a 60 Hz panel from having the same 10 ms ghosting time as a good 120 hz panel, and the limitations in regards to going lower apply to both - with just 60 Hz you just can't possibly attempt to start said transition "ahead of time" (and game modes don't attempt this). I don't know which specs the W605B has in this area but it can't be that bad.
Understand, the thing about 120 Hz and 240 Hz panels is that for said figures they have to have less ghosting time than a bad 60 Hz panel or it would be useless (they also cost more to boot so they're supposedly upmarket as well). That's not saying much because a 60 Hz panel could be pretty close @ 60 Hz because ghosting time and Hz are different figures - an internal frame @ 240 hz takes 4.2 ms and no LCD can fixate big color changes in that time (simple gradations, sure). Hell, Plasmas had 6 ms ghosting time. OLED can do it, but it's still in the rock ages in lots of other fields..