Question, Focus Assist: Does Focus-in-Red Work With Manual 3rd Party Lenses?

Does it work only when there's sharp contrast like shown in Panasonic's pic on the link above? Will it hold up and work with a scene with lots of activity and shallow depth of field?
 
The red outline works on high-contrast sharp edges. If you're shooting a perfectly white sphere, it's not going to show up at all. If you're shooting a face, it'll show up on their glasses, in their eyebrows, on their eyelashes, and in the catchlights in their eyes.
 
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