It is horses for courses and down to personal preference in terms of the photography you do. I am happy with my Fuji X system, and my go-to body is the X-E5. Coupled with the 16-50 and 70-300 lenses, they are my travel kit. Re the body, the X-E5 is smaller and lighter than the OM-1 Mk 2 and the OM-3 and slightly smaller than the OM-5 Mk 2 though a bit heavier. The OM-1 and 3 are more expensive in the UK. The X-E5 has 2x the pixels.
Would I change? No, I am happy with what I have, and the cost of changing is too high.
That's just me.
Jonathan