SD15 AEB Clarification

SIGMA SD15

I had previously discussed the new Sigma SD15 and its new 5 AEB feature.  What I just learned is that the SD15 has the following AEB capabilities:

With 3 frames for Auto Bracketing : 1/3EV Stops Up to ±3EV
Maxing the steps between each shot would lead to under exposed to over exposed as follows:
[ -3.0, 0, +3.0 ]

With 5 frames for Auto Bracketing : 1/3EV Stops Up to ±1.7EV
Maxing the steps between each shot would lead to under exposed to over exposed as follows:
[ -3.3, -1.7, 0, +1.7, +3.3 ]

I would have loved to have seen jumps of at least 2.0EV between each shot on the 5 AEB capture mode for some wide dynamic range scenes, but the new 5 AEB setting is a welcome one.  At the price point the Sigma SD15 is set at ($859 through Amazon Pre-Orders), it is the widest bracket you can get for the money.  Nothing even comes close for that price point.