Originally posted by biz-engineer Why such question and why does it matter?
It doesn't matter in the grand scheme of things, like much of what's discussed in our community. It's just a pleasant discussion topic that we can choose to engage in or not, as we wish
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To the OP's question:
My larger systems are Pentax K-mount for APS-C and Sony A-mount for full frame... weird mix, I know, but I won't bore you with the details as to why; I've posted about them previously.
My A-mount gear includes several larger and/or faster lenses - 24-70 f/2.8, 70-200 f/2.8, Tamron 150-600 (G1) etc. When I'm shooting any of those lenses, I consider that my "big" system.
My K-mount gear includes a number of APS-C bodies, old and newer, and a fair range of prime and zoom lenses - but, with the exception of my DA*60-250, they're all fairly compact and manageable. As such, I consider this my "mid-size" system, and it's what I shoot most frequently.
I
adore the Q system and often choose to shoot with that alone. It depends on the situation and use case(s), of course.
If I'm merely going out for a morning, afternoon, or full day of shooting, I typically only carry one system and two or three lenses appropriate to what I think I might be shooting. If I'm going away for a weekend break or more, I'll take either my big or mid-sized system with a few more lenses
and my Q system (usually the Q7) with 01, 02 and 06 lenses. Depending on where I'm going and what I'm doing on any particular day whilst on vacation, I'll choose which system to carry.
I don't ever walk around with more than one system. I may have in the past at some point, but I certainly wouldn't nowadays... I try to carry as little as possible