I think you may have missed the point, this was about shooting using One Shot Focus vs AI Focus, not single shot vs high speed drive.
If you didn't miss the point, BL may be taking 2 shots instead of one, but on a 1D body it will take a long time to get anywhere near anticipated shutter life, unlike a burst shoot where it is easy to run through tens of shots.
So I've never owned a camera I felt confident enough to trust in AI Servo until I started shooting with the 1Dx. Old habits die hard though, and I'd still been toggling between one shot and AI-Servo based on subject matter. I've always held this pre-conceived, personally unfounded notion that One Shot would be more accurate than AI Servo on stationary subjects. Given how amazing I found AF accuracy to be on the 1Dx, I decided to test my theory by exclusively using Servo mode for all non moving subjects.
In the past month I've shot mostly portraits, some landscape, and quite a bit of macro. At the pixel level, I can't tell any difference in regards to focus accuracy between shots taken using One Shot vs. AI-Servo based on my real world use. Granted, I have my shutter release priority biased towards focus as opposed to release. I don't see myself using One Shot ever again as far as I'm concerned, and I appreciate not having to press a button or switch modes to engage Servo if something does start to happen unexpectedly.
Can anyone think of any cons to using AI servo fulltime and ditching One Shot if I I'm able to achieve the same level of accuracy? (ok yes, as a concession I'm taxing the battery, but battery life has become a total non issue for me having moved to a 1D body)
Thanks in advance!
1. Shutter life. Makes no difference if you have the $$$. Makes a difference if you don't have the $$$.
When I had a T5i or the 70D I didn't care if I rand high speed or whatever all the time. Since buying the 5D Mark III I have switched to almost entirely single shot.
One thing to point out too is this: I also switched genres about the same time. I am more into portraits and far less sports or BIF.