I did the update on both units. I will say I think the 898 SI/DI images are better and I am happy with those. However, 2D is still not good on either unit. I restored defaults before and after the updates. Here are a couple shots from the 858. Transducer is from the US2 on my Terrova. Using the following settings:
200Khz
Surface clutter - 5
Clear Mode
Fish ID-5
Dual Beam
Fresh water
Noise Filter - Low
Sensitivity - 10-12
Chart speed - 5

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Had very similar images on the 898 as well. I did forget to switch it to Dual Beam (though you shouldn't need too!!) Not sure what to do. Fish are likely Asian carp(Illinois River)