Teste p/ verificar se as lentes Fuji X tem cobertura em um sensor maior:
O teste foi feito apenas com lentes primes.
[b]Conclusions: only some of the tested primes would cover APS-H. Most would not.
This kind of kills the hope of those X-shooters wishing that Fujifilm would put an APS-H sensor on an X mount camera.
[/b]
Lista das objetivas testadas e seus resultados:
XF14mm f/2.8 – covers only APS-C, not APS-H
XF 16mm f/1.4 – covers only APS-C, not APS-H
XF 23mm f/1.4 – covers only APS-C, not APS-H
XF 23mm f/2.0 – covers only APS-C, not APS-H (but image circle a bit bigger than XF23/1.4)
XF 27mm f/2.8 – covers only APS-C, not APS-H
XF 35mm f/1.4 – covers APS-C and APS-H, but not FF
XF 35mm f/2.0 – covers only APS-C, not APS-H
XF 50mm f/2.0 – covers APS-C and APS-H (but with strong vignetting)
XF 56mm f/1.2 – covers only APS-C and almost also APS-H, but he’d not recommend it
XF 60mm f/2.4 – covers APS-C and APS-H (but with some corner vignetting)
XF 90mm f/2.0 – covers only APS-C and would work great also on APS-H
Como foi feito o teste (algumas imagens):
https://alikgriffin.com/wp-content/uploads/2021/05/AlikGriffin_FujifilmLensesOnZ6-2-L-574x382.jpg
https://alikgriffin.com/wp-content/uploads/2021/04/Fujifilm_35mmf1.4_ImageCircle-L-1536x1022.jpg
Fujinon 35mm f1.4 Image Circle
Artigo completo aqui: Fujifilm’s FX Image Circle - Bigger Sensor Possible? | Alik Griffin
Boa Leitura! 
Lembro há muito tempo de ter visto um papo sobre este boato. Mas nunca achei que alguém levaria a sério. Pelo menos agora está esclarecido.