Here is a summary or excerpt from an article that has just been published on DPNow:

With the new CX5 model, AF focusing times are decreased to as low as 0.2 sec. for both wide-angle 28 mm and telephoto 300 mm, up to half as short compared to the CX4, using Ricoh's unique new hybrid AF system. 10This ensures that you reliably capture the image you were waiting for, never to miss another good shot again.
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With the new CX5 model, AF focusing times are decreased to as low as 0.2 sec. for both wide-angle 28 mm and telephoto 300 mm, up to half as short compared to the CX4, using Ricoh's unique new hybrid AF system. 10This ensures that you reliably capture the image you were waiting for, never to miss another good shot again.
Click here to read the whole article...