I have a Rodenstock 4,0/80mm and another one for sale: Eur. 70,-. The differences with an APO are very small. You will find more differences in the same lenses during the years of production.
And yes, 4,0 is more convenient in focus however I have a Meopta Meogon 2,8/80mm too and when comparing at 8,0 both lenses are equal in the prints.