My kit has been gradually whittled down.
I use the Elmar M as a standard. The newish Summicron has been sold. I have an 'old' 1.5 Summarit for those rare moments.
The rest consists of 2.8 Summaron, CV 21 mm (which I don't really like) and 90 Elmarit M (last one not sure if I have the name quite right) plus 135 Tele Elmar.
Putting the Summarit and the CV to one side, the Elmar M sits very well in a Summaron, Elmarit M, Tele Elmar line up. All have their 'signatures' and all are great perfomers.
Also worth noting that these are not the most expensive lenses around...
...and yes, you have to get used to the Elmar, but if you were brought up with 'proper' Leicas, you'd be used to collapsible lenses by the time you got to your 50s.
Michael