Mate, just buy one. Unfortunately, behind the cloak of a computer screen, there are many who cannot fathom the fact that some people can and want to afford nice things. They will go out of their way to enforce their envious belief that you don't deserve, for whatever reason, the item you want to purchase. Whether that be a bike, car, fishing rod, golf club etc. Dependant on whatever forum you're posting on.
To be quite frank, it's a proper bike, used by proper riders, for proper races.
Why anyone would doubt its integrity as a 'proper' bike is beyond me. Suppose you could go and buy a dogma. I imagine the same green eyed monsters would pop up saying that it's a bag of shoot.
I don't think anybody is doubting the integrity of the Venge as a proper race bike. However, the OP already owns a Tarmac, which is also a proper race bike. They are just designed for different situations. So on a flat stage, a sprinter on a Venge might gain a few seconds over a sprinter on a Tarmac. However, on a mountain stage, a GC rider on a Tarmac would comfortably beat a sprinter on a Venge. It's horses for courses, quite literally.
However, this is all academic really as the OP
is not a professional racing cyclist. They wanted to know if they would notice any benefit of the Venge over the Tarmac, and for your average MAMIL on a normal Peak District sportive or whatever, and assuming by benefit they mean faster times and such, the answer is almost certainly
no.
If the OP did want to start racing then quite frankly, even the Allez would be good enough for amateur races.
And FWIW the green eyed monster does not come into it. Like the OP, I already have a nice road bike. If I could afford a Venge though, I wouldn't buy one. As I said upthread, I would rather spend the money on doing something nice with my family as ultimately that would make me more fulfilled and happier.
I wish there was more actual meaningful advice on this forum sometimes, and less of the exhortation to spend exorbitant sums of money just for the sake of it. Yeah, nice bikes are nice, but at the end of the day it's just stuff, and stuff don't make you happy.
As always though, YMMV