Great shots! m4/3 sensors aren't too small for shallow dof work, with the right focal length and lens speed. Ultrafast normal lenses are the cost/performance champs for this kind of work. You can find beater Nikon 55/1.2 lenses with good glass for around $200. Depth of field is _very_ narrow, so getting sharp faces (for example) with moving subjects can be challenging. If f/1.2 lenses are out of budget, there are literally heaps of 50/1.4 lenses selling every day for $50-$75. f/1.4 dof within 5-15 feet is still shallow enough to isolate subjects, and you have a bit more margin for error.
If someone wants to check dof tables, an interesting question is whether an average 85/2.8 slr lens has similar shallow dof to a 50/1.2 at closer distances. They'd be cheaper than most 50/1.2.
And +1 for mabelsound on adapted rf lenses having close-focusing issues. A $250 Zeiss/Contax 50/1.4 focuses to 8 inches or so, while an $800+ Leica 50/1.4 Summiluix-M won't get you much closer than 1 meter. I tend to forget this when shooting with real rfs, since the parallax error makes shooting that close not very practical.
