Which one? All of these are nearly publicly available information or can be directly inferred. Except they are either from Annual Report, Investing Meetings, Court Documents, or actual Geekbench numbers. The problem is people read Macrumours or WCCftech and believe they have informed.
1. It is not huge, by CPU Core or by SoC Die Space.
2. It is not low-yield either.
3. Comparatively speaking, what Apple include their SoC as BOM / COGS isn't anywhere as high as Qualcomm charges, hardly a small fortune.
4. It is performing close but at a much lower wattage. That is not just coming from a node advancement but mostly microarchitecture.