A lot of map threads have been around today - Some has been serious, others not.
I stumbled upon this detailed post on Reddit from a user named Yosik:
GTA V vs. SA: http://i3.minus.com/ibxSxKT9m7OCdE.png
GTA V vs. IV: http://i1.minus.com/ibe5rbXEZhgfTr.png
GTA V vs. RDR: http://i3.minus.com/i2z2JyqS6DNEU.png
GTA V vs ALL: http://i4.minus.com/ibn8B5Vpb26ws6.png
If Yosik nailed it, this map is HUMONGOUS!
Thx to Yosik for the detailed explanation and work