It makes sense. Generally, larger transistors are less noisy because they're roughly equivalent to many small transistors connected in parallel, which also reduces the noise.
Noise sources are uncorrelated waveforms, so adding noise sources together doesn't generate double the noise voltage, as only the parts in phase add, the other parts will be anti-phase so will subtract. If you take a signal, put it through two amplifiers, each adding equal noise to the system, then take the average output of both of the amplifiers, the result will be less noisy, than if you'd only used one amplifier.
Here's a link what Linear Technology say on the matter:
http://www.linear.com/solutions/5657