I dunno. From Wiki: “The Fujifilm X-Trans is a CMOS sensor developed by Fujifilm and used in its Fujifilm X-series cameras. Unlike most CMOS sensors featuring a conventional Bayer filter array, X-Trans sensors have a unique 6 by 6 pattern of photosites. Fujifilm claims that this layout can minimise moiré effects, and increase resolution by eliminating the need for a low-pass filter”.

I beleive that Fuji owns the patent, but it would take some effort to know whether Fuji fabs the sensor in their own foundries (Fuji is a major chip and device manufacturer who currently fabs the SPARC CPU, among other devices) or contracts the fab to Sony.

Very helpful, Mickey...thank you.

I've posted Tom's website on this forum a number of times. I know him, I've taken classes by him, and he's certainly not an "armchair expert" ~ he's an avid hiker and professional travel photographer.
Hopefully, his experiences will help you with your decision.

One more thing: As craggycrosser suggests; do your own research about anything you read or we advise. Not all M4/3 camera/lens combos are lighter than APS-C, and not all APS-C combos are just as "big and heavy" as the typical DSLR combo. The Panasonic G9 vs. the Fujifilm X-T20 are examples.
_Van

http://photoseek.com/

craggy, one thing I find interesting about the questions asked on this forum, that are similar to that of the OP (here):

They seldom follow the thread and answer the clarifying questions needed to really help them toward a conclusion. Simple (well, maybe not so "simple") questions such as; which lens (or lenses), do you plan to use? ~ what do you plan to do with the information that ends up on your SD card? ~ how much weight can you "enjoy" in a camera system? ~ what is your camera budget (the OP gave us a hint with her question, by telling us which cameras are in her decision making process).

I'm thinkin' that if OP's with these questions would honor the forum members with reasonably well thought out answers, they might get more reasonable advice.

No?

Hey "California Girl" and greetings from the UK !

I'm not gonna tell you which side of which fence I fall ...... but would simply say that I've been a member here since 2012, a mirrorless user since 2013, and watched zillions of nice people ask for "help to decide".

Already you've been inundated with "other people's" "alternatives"........ the "I use" community.

All I'm gonna say is "work it out for yourself"...... is that too difficult?

The strongest decisions we make in life are those based upon our own answers to our own questions.

Take your time.

I would recommend the FF Sony A7III for better image quality,especially in low light. However the Sony A6500 is also an APS-C format like the excellent Fuji XT-3 and has excellent performance, light weight and there are excellent and affordable, lightweight lens for it. Sony is set to announce its successor, an A7000, perhaps before Christmas. This will use the same Sony-Built 26 megapixels sensor that is in the Fuji XT3, and will have A9 like features with 20fps frames rates; and XT-3 video performance like 4k/60p. If you can wait until then I would and then compare size and specs. Cheers