Worth upgrading e-pm2 for low light

I have an e-pm2 that I am quite satisfied with. This system is mainly used for travel where size is extremely important. Has recent progress in sensor and processing power made it worthwhile to upgrade?

I am primarily interested in landscape/architecture. AF speed is not that important to me. However, IQ under moderate high ISO (~ISO 1600) is important.

The EPM2 has the same 16MP sensor technology as all current Olympus Pens, EM5, and EM10. You have to go to the PEN F and EM1-MKII to get a better sensor.

If you don't already have a fast prime, consider an Olympus 17mm f1.8 or the Panasonic 15mm.

The Panasonic 20mm f1.8 is a bit slow focus for low light in the city, but is sharp, and often found for under $200 used. I paid $160 for a used one. It is so small that I lost the first one, and just had to have a replacement.

I like my results for night time cityscapes using the even older 12MP sensor with a fast lens. I suggest a faster lens over a body upgrade,

baxters wrote:

The EPM2 has the same 16MP sensor technology as all current Olympus Pens, EM5, and EM10. You have to go to the PEN F and EM1-MKII to get a better sensor.

If you don't already have a fast prime, consider an Olympus 17mm f1.8 or the Panasonic 15mm.

The Panasonic 20mm f1.8 is a bit slow focus for low light in the city, but is sharp, and often found for under $200 used. I paid $160 for a used one. It is so small that I lost the first one, and just had to have a replacement.

I like my results for night time cityscapes using the even older 12MP sensor with a fast lens. I suggest a faster lens over a body upgrade,

Thank you both baxters and d3xmeister for your comments. The responses are consistent with my expectation on sensor development.

I mostly use wide angle zoom, so the 20mm is too narrow for me. The reason to use zoom is convenience because I prefer to minimize the need to change lenses especially when traveling.

The zooms I have are sharp enough for me. I often prefer to shoot under somewhat challenging light conditions without the help of a tripod. Fast aperture is also not useful because I need the DOF, so performance at moderately high ISO is important.