I am still playing Gran Turismo 4, believe it or not. I've not the money, being a college student, to invest in the ps3 or Gran Turismo 5 yet. Recently, I have hit a spot of good luck and have acquired more funding, so, now I have the money to finally buy, I am wondering just how big of an improvement Gran Turismo 5 is over Gran Turismo 4. What are some noticeable differences between the physics simulations? How well has the g25 been incorporated? Has the AI been improved, and if so, in what ways has the AI been improved? In GT4 the AI ignored your presence when making quick overtakes, sometimes rubbing the outside of your car, does this situation still occur? Most importantly, how has our cash crop B-spec driver been improved? Is the player base still strong?