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140/200 = 0.7
3/4 = 0.75
9/16 = 0.5625

Based on your FOV numbers, that should mean that 4/3 aspect ratio is much closer to normal vision than widescreen 16/9.

It seems perfectly reasonable therefore to suggest that 4/3 (all other things being equal) actually would give you a more immersive experience than 16/9.