The only fuzzy logic I saw were your price quotes that don't align with well known sellers. You broken record of price estimation is still revolving if I keep doing the price checks again. As for quality, your assessment doesn't alight either with actual photos. You may be looking at stat sheets, but tangible real examples prove otherwise. Referring mostly to canon vs. canon that is. Canon vs. Sony, apparently Canon is made in Japan and offers an added extra control ring multiplying functionality, whereas Sony is made in China, and apparently functions very good.RF 24-105 is optically not better than EF Mk. II, but 40% more expensive. RF is optically slightly behind Sony 24-105. No amount of fuzzy logic will change that. facts are facts.