depends on the gym, bro. some looks heavy and big, but with the cables and all, it becomes light. there are some smiths that don't have those fancy cables and only the bar and locks, those are admittedly heavy. maybe a bit more than the olympic bar.
One other thing you need to take into account is how much drag is on the bar, a nice clean bearing'd one will ride smooth and provide less resistance (weight) vs a gummed up rusty riding bar, actual weight of the bar may be less, but you are pushing more weight because of the resistance in the bar.
I spray WD40 at my gyms bar before I workout it makes feel stronger than most folks there I make sure the poles are greased really good too...a 45lb bar weights like 1lb after all the grease so I load up 315lbs on it and rep away doing benches it when in reality it is only 225lb feeling due to all the greas slinging around....it works wonders.