as evan said it's a personal choice, but i shoot flat with my T2i. when I use my HVX I boost colors like evan does because the HVX will give you shots with nice, accurate colors that can still be graded. when i shoot with saturation and contrast boosted in my T2i, the shots get kinda weird looking and are a fucking nightmare to grade. sometimes i also just slightly adjust the colors in camera, like -1 contrast and +2 saturation. so it's not totally flat, gives you nice looking shots, and makes color grading easy.