Even at 1080/60 no way will H5 look comparable or worse than 4.
Let us do some basic math here. 60 FPS takes twice the power of 30 FPS to achieve. Add 1080p and that takes another 4x the power. So at 8x the power of Xbox 360 required for these updates, the Xbox One is already out of juice. I think Xbox One sits at around 6x 360 processing power.
Translation: "I don't understand anything about computer components, so I just refer to all of it as 'POWER'"
Bungie never focused on graphics? Halo 1 and 2 were easily some of the best looking games on Xbox. Hell, PS2 never really even had a FPS that looked on par with Halo:CE at the same scale. Halo Reach looked great on Xbox 360 even though it had a **** framerate. The only Bungie Halo where I was completely underwhelmed graphically was Halo ODST.