[Brightcolours]

Pentax K3? It is a heavy camera (800 grams), heavier than my full frame Canon EOS 6D. Not sure how it would be so much preferable over the Nikon D600 then.

 

The Pentax K3 weighs about twice what the Canon 100D/SL1 weighs. Size wise, the difference is also considerable:

http://camerasize.com/compare/#485,448

 

Then lenses: while Pentax has many compact lenses, only a few are of interest. Some don't render nicely, and there is a lot of overlap. One can put together a smaller, lighter package around the 100D. Pentax 21mm f3.2 - Voigtlander 20mm f3.5. Pentax 31mm f1.8 - Sigma 30mm f1.4 Art. Pentax 40mm f2.8 - Canon 40mm f2.8. Pentax 77mm - Canon 85mm f1.8/Tamron 60mm f2.

 

The Canon 100D would also have a much better and bigger UWA selection (including the Canon 10-22mm and the Sigma 8-16mm).

 

I know with which APS-C DSLR I would rather travel with... The compact, light SL1/100D.

 

But, would I recommend it over the mirrorless Fuji/MFT options to the original poster? Probably not.

 

On "AA-less IQ".... I don't find the squareness of the pixels resulting in aliasing, false sharpness/details and moire patterns "better IQ". Just a false sense of sharpness one can also get by badly sharpening an image, if one desires it.