E-M5 sometimes annoys, maybe get an E-M10?

I have had my E-M5 since May 2012 and mostly have liked it. Much smaller and lighter for travel than the DSLRs that I used to use. In many ways it is very responsive like a DSLR and single AF is quick and reliable. There are several things that drive me up the wall about it though and my month in Thailand that just ended reminded me of those things all over. There may be an E-M5 II announced soon so I will wait to see about that, of course. I have also considered the E-M1, but although it is a very nice camera and fixes some of the things I dislike with my E-M5, it is bigger and heavier so for my purposes I think I will pass again as I did when it came out.

The E-M10 also fixes several of the things I hate about my E-M5 and now it can be bought new for less than $500 here in Japan. From what I can recall these are the pluses and minuses compared to the E-M5:

Pluses:

• 0 second anti-shock setting
• MySets can be assigned to mode dial
• built-in flash (for a quick pop of outdoor fill flash)
• slightly smaller with a lower EVF housing for a more sleek, smoother top
• rear buttons have better feel and are slightly larger
• buttons just above the LCD are better placed and easier to press
• higher resolution rear LCD

Minuses:

• 3-axis IBIS
• smaller battery with less capacity and a different charger
• not weather sealed

Does the E-M10 have the same slow wakeup from sleep mode as the E-M5?

Can the E-M10 still get banding with Panasonic 20mm f1.7? From my understanding it can, but the E-M1 is okay. I recently reluctantly bought an Olympus 25mm f1.8 to use for travel instead of the 20mm so this issue isn't as pressing as before, but it would be nice to be able to use my 20mm like I always intended when I bought it.

Anything I missed? Any comments? Thanks!