I see what you mean, in a sense kinda, given they're almost the same width. The screen isn't as tall due to the 1.9:1 aspect ratio though, which IMO is a better fit for non-IMAX filmed or IMAX formatted (presented in scope or 1.9:1 respectively) films anyway, and I really like the seating layout, which is much closer to the layouts of 70mm screens. Despite being digital and of the 1.9:1 AR, this actually feels like an IMAX.
Yeah, I know the BFI is Odeon now so I hope they do something there. They're just pushing LSQ as the preferred London venue so, I have my concerns...