The 5000 series has the same base bottom rack as my G7100.
If I checked the right product (not currently in my flat up north) on the IKEA page my plates are 26cm in diameter, that's 10.23".
They almost fit side by side as in there is maybe 2-4mm of overlap.
I can place them side by side and they get cleaned, but they touch.
However, I rarely need to as I can fit 10 plates in one row.
I use the left side for dinner plates, the right side for smaller plates and/or pans.
Pots in the front right, deep plates front left.
Another loading alternative is keeping the back MultiFlex area open for pots, pans, bowls etc. and using the front row of tines for the plates.
Though I think in general if stacked correctly, the Miele can hold more miscellaneous items more easily, the Bosch in the old flat can hold more overall.
If you often have mixed loads, I think the Miele is better (love the option to slant the top rack).
If you often just have one pot, one pan, one bowl and plates the rest, the Bosch is better.
On the flip side again, we have a Miele in our work break room and it can hold more cups than a Bosch ever could IMO.