Comparing like for like as far as possible according to Mr Haynes Senator 3.0 24 v auto with A/C is 2065 kg and a 3.0 Omega is between 2095 kg & 2125 kg. That makes the crappy Omega heavier than a superior Senator.
Those have got to be max gross weights?
I have a feeling my MV6 is around 1650 kerb weight.
According to the ABS web site a 24v senator auto is 1608.
Not a great deal in it but the Senator doesn't look heavier. It's weight distribution that counts, however, and the V6 Omega has most of the engine weight set well back in the vehicle, as anyone who has tried to work on one will have the knuckles to prove.
Since the Senator is an inline 6 a significant proportion of the engine weight overhangs the front axle which is bad for handling.
Still have warm recollections of my dad's 24v Senator though.
Whilst my 3.2 MV6 is theoretically superior in most respects there's something the Senator had that's missing on the Omega. Can't put my finger on it though. Maybe just nostalgia as previously mentioned.
Kevin