Which lenses need micro-adjusting?

[neuroanatomist]

The curve plotted by FoCal Pro shows why you might not really need to adjust, the top of the curve can be broad so a little focus error might not be a problem.  If you have a very wide aperture lens, it can be a narrow peak.

Indeed, as long as the peak of that broad curve is somewhere near zero.  In the example you show, no adjustment would be pretty far off from optimal.

[Daniel Flather]

With my 50/1.2 that I only shoot at f1.2 (why else buy it?(well, besides the many other reasons to buy it)) any adjustment I dial in is lost due to subject or camera movement.  So why bother setting an AF adjustment?  If I shot everything on a tripod with a static subject, then yes, it needs an adjustment dialed in, but in that case I would be manual focusing anyways, so the adjustment is moot. 

This is what I've come to realize lately.  ymmv