To add to the already good advice here, I have seen repeated sub-second draws and hits on target of a 1911 from a leather IWB holster by a skilled Ex level IDPA shooter. Not much under mind you, but in the 0.94 to 0.99 range.

Use what you like, and practice with it. Have fun and repeat.

"People do not seem to realize that their opinion of the world is also a confession of character."  Ralph Waldo Emerson