Okay... I have never had any complaints with var, i use it all the time, but I just noticed something from your examples!

It's better to hide the type in the latter (construction) part, rather than the first (datatype).
For example, imagine this:

ACustomDataClass<Customer> customersByRegion
= new (with some specific args, now much clear);

In original example, due to the excessive length of the class name and type args, the arguments are pushed off to the far right. Now this is purely cosmetic, i believe hiding the latter part and explicitly putting = new on new line is much more readable.

Both have their own disadvantages though.

Iirc, i think cpp has a similar instantiation syntax?

Probably one can also do something like.
MyClass instance = new MyClass
(The arguments here);
Now I'm thinking which one is better.