Sony Nex-7 C/W LAEA2 & Sigma 105 Macro Lens?

Hi,

I have a Sony Nex-7 and I am looking to purchase a macro lens to go with it. As I am not a huge fan of the Sony E-mount 30mm macro I was considering purchasing the LAEA2 and either the Sony 100mm f2.8 macro or my prefered choice at present the Sigma 105mm f/2.8 EX DG OS HSM Macro Lens in Sony Fit.

Before I make a decision has anybody tried the Sigma lens with the adapter on a Sony Nex-7?

What is the Autofocus like and does the HSM motor work when using the LAEA2?

My main use for the lens will be photographing Flowers and Insects. Any other Macro lens worth looking at instead?

Cheers

Richard