^^ I am not saying there is no advantage to the Moto G but the P780 has its pluses.
Having the option to add more memory is always a plus point cause you never know what you might load on the phone. I felt 8 GB on my old BlackBerry as tons of space. Now I have a 16 GB phone with 8 GB memory card and both are almost full with apps, game data, roms and music. No space for any videos unless I buy a 32 GB card.
I wouldn't call the Motorola G screen as better, just higher PPI. Honestly I was hard pressed to tell individual pixels apart on the P780 at the store I checked it out.
And the 'brick' as you call it weighs just 33 gms more and is actually slimmer than the Moto G.
Also the battery on P780 is removable. Again a big plus if you wish to use the phone for a few years.
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iPwnz - Its not 4k. More like 2.5k difference. Though you will need to purchase another memory card for the P780.