I can often notice some moire in my photos taken using either my Pentax smc A 20mm f2.8 or my Tamron SP 90mm macro Di, they are razor sharp, the good news is that moire is only visible at 100% zoom.
Here is an example:
The whole photo resized:
A 100% crop without AA simulator, look at the barrier:
Same crop using "type 1" AA simulator setting:
Same crop using "type 2" AA filter simulator:
My conclusion: type 2 AA filter simulator performs well but sharpness decreases in the same time.
Some apps (e.g. ACR, Dxo, LR) perform very well and do not affect sharpness, so I prefer to use them instead of the AA filter simulator.