Well luckily, I got 5D Mark II sets from my school for 4month renting. It was so lucky. Well I was using 5D Mark III that school has but they approved only 5d Mark II, 70-200mm f/2.8 II, and 24-105mm F/4. I really loved Mark III because of the noise quality, more AF points, AF accuracy, and etc. 5D Mark II is still a good body to use for pro uses such as studio shooting. However, it will be the greatest challenge to handle this inferior performance since I always rented Mark III. The image quality is just fine. Noise quality is also fine around 5000. But I really hate the AF points and accuracy that reminds my Pentax K-5. Less AF points is really making me mad to shoot. The AF accuracy is really bad that I can not control the depth of field while I'm using 70-200mm lens. I'm a Pentaxian but I really sensitive with the AF accuracy so much. That's why I hate Pentax even now. I massed up my studio shooting when I used Pentax K-3 that I rented before. Anyway, AF accuracy and points are the most hard things to control to get best pics. So, is there any way to enhance AF performance?