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.
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.
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.