I have been doing some fresh work with a familiar subject (a volunteer project, for enjoyment and to help out at my wife's school).
At first I thought I would miss the 40-150 F2.8, but as I was working something struck me. Almost all of the images hanging in the school, be they on signs or in brochures, were taken with my original kit, before I "went pro" with the f2.8 lenses.
Because I will not show the ones of the children (it hurts, because there are some lovely images, I will have to limit myself to images taken of "safe" subjects. EM5 mk1 75-300 at about 200m
The bulk of the work, even indoors is with the 45, 75 and 75-300 slow zoom (!). There was only one image, taken as a "freshener" for an already established project, that was taken with either of the newer lenses.
I really felt I would miss the combination of length and speed, but the extra separation of the 75mm at f1.8 to f2 gives me more creative and often technically better quality shots.
The true lure of the big lens is the lightning fast AF, that made even my older EM5's perform admirably for indoor sports.
What I don't miss are the weight, the sometime weird Bokeh and the feeling I need to do something worthy to justify it.