To conclude:
Option 1:
Stick to EFM and sell all my EF and EF-S equipment for cash. I have only ever bought B&H Photo (during my trips to NY). I have never sold anything ever - in the past, I gave my 40D and 60D away (with a kit lens) to my friend's kids to get them started. So I am contemplating taking everything in a camera bag and dropping it off with them. How would I know what a fair market value is?
Option 2 move to Canon RF-S. What are the advantages the RF-S system has over the EF-M? Would Canon be supporting the smaller sensor cameras long term? I would have to sell all my EFM equipment and the following EF-S (EF) equipment:
Canon 77D body
Canon 100D body
Canon EF 28mm f/1.8
Canon EF 70-300mm f/4-5.6 IS
Canon EF 24-105mm f/4 IS
Canon EF 100mm f/2
Canon EF-S 60mm f/2.8 Macro
Canon EF-S 17-55mm f/2.8 IS
2 x Canon EF-S 18-55 4-5.6 IS STM
2 x Canon EF-S 55-250 IS f/4.5-5.6
And retain the following for use with RF-S:
Canon EF 50mm F1.4 290gms
Canon EF-S 10-22mm f/3.5-4.5 USM 385gms
Then either get the R50 or R10:
Canon R50 system 1725 gms (total investment $1410 less trade-in)
Canon EF-RF adapter 110 gms ($99)
Canon EOS R50 375 gms + 2 lens kit ($1030)
Canon RF-S 18-45mm F4.5-6.3 IS STM 130gms (kit)
Canon RF-S 55-210mm F5.0-7.1 IS STM 270gms (kit)
Canon RF 16mm f/2.8 STM 165gms ($280)
Or get the R10:
Canon R10 system 1776 gms (total investment $1760 less trade-in)
Canon EF-RF adapter 110 gms ($99)
Canon EOS R10 426 gms + 18-45 lens kit ($1000)
Canon RF-S 18-45mm F4.5-6.3 IS STM 130gms (kit)
Canon RF-S 55-210mm F5.0-7.1 IS STM 270gms ($350)
Canon RF 16mm f/2.8 STM 165gms ($280)
What are the advantages of the R10 over the R50?
Option 3 move to Canon RF. I am more confident of Canon's support of the RF system. I could sell all my EFM and the following EF-S (EF) equipment:
Canon 77D body
Canon 100D body
Canon EF 28mm f/1.8
Canon EF 70-300mm f/4-5.6 IS
Canon EF 100mm f/2
Canon EF-S 10-22mm f/3.5-4.5 USM
Canon EF-S 60mm f/2.8 Macro
Canon EF-S 17-55mm f/2.8 IS
2 x Canon EF-S 18-55 4-5.6 IS STM
2 x Canon EF-S 55-250 IS f/4.5-5.6
And retain the following for use with the R8:
Canon EF 50mm F1.4 290gms
Canon EF 24-105mm f/4 IS 700 gms
Get:
Canon R8 system 3355 gms (total investment $3900 less trade-in)
Canon R8 body 460 gms ($1500)
Canon RF 15-30mm F4.5-6.3 IS STM 390 gms ($550)
Canon RF 100-400mm F5.6-8 IS USM 635gms ($600)
Canon RF 24mm f/1.8 IS 270 gms ($600)
Canon RF 85mm f/2 IS 500 gms ($550)
Canon EF-RF adapter 110 gms ($99)
I am torn between staying with the EFM or moving to RF or the RF-S.
The R8 isn't much heavier than the R10, but the RF lenses are much heavier than their EFM and EF-S counterparts. Besides, on the APSC sensor, I can use a 300 gm 50mm f/1.4 instead of a 500 gm 85mm f/2. It's another matter that for the R8 body alone, I could get an R50 along with two kit lenses, a 16mm f/2.8 and an EF to RF adapter.
I know that a full-frame system offers better low-light performance, and there have been occasions when I have been forced to push the ISO over 3200 and live with a grainy image, but the trade-off has been the ability to travel light. To quote DP member quiquae (see link below), "The reason why I'm interested in R10 is because I've been leaving my EOS R system at home due to the excessive bulk too often lately".
https://www.dpreview.com/forums/post/66185618
Thanks, everyone. It's pretty tough to name each one of you individually.