Not necessarily.30mm scopes are generally used for long range shooting because they offer a larger adjustment range.If you sight in at 100 yards,you may only be able to adjust the elevation to hold dead on to say 600 yards with a 1" scope,and out to 800 yards or more with a 30mm scope.Depending on the cartridge,you may still need a tapered base to reach 1000 yards with a dead on hold.

As far a field of view is concerned,compare the 1" Leupold vxII 3x9x50 and the 30mm Leupold European 3x9x50.The 30mm tube is larger,but the field of view is the same.