I'm a newcomer to this group and I hope members will be willing to share their experience and give me some advice about my recent gear choice (and I hope this is the correct section to post this). I have long used Olympus and Pentax gear in tandem as my 'big and small' equipment. Starting way back with a Pentax ME Super (big) and Pen EE3 (small). More recently I was using a Pentax K5 (18-135mm) as my 'big' camera and a Pen E-PL2 (14-150mm) as my 'small' go everywhere camera, with a variety of other lenses in both formats (and a few other digital cameras including a Samsung NX system). I upgraded the E-PL2 to an OM-D EM-5 four or five years ago. Thinking that these cameras were getting a bit long in the tooth (like me) I was tossing up between upgrading the Pentax or upgrading the Olympus. For a variety of reasons, including what I read about it being a really good camera and really good lens, I decided on buying an EM-1 Mark ii and the 12-100mm F4 Pro lens thinking, amongst other things, it would be a bit lighter and more portable than the Pentax K5. Anyway having just received the EM-1 combo I was a little surprised (lack of research here on my part) to find it is a little larger and about 200 g heavier than the Pentax K5 combo. So far I have taken a few dozen test shots with the EM-1ii and 12-100mm lens and the quality is very good (but not obviously any better than the Pentax K5). I expect to find that the EM-1 has better focusing ability than the Pentax. Has anyone else any experience of using both the Pentax K5 and EM-1 Mark ii or a similar pair? What were your conclusions. What do you think about the trade-off between camera size/weight and sensor size/quality? Would I have been better to get an EM-5 Markii as it's lighter than the EM-1ii but presumable not as good IQ and would not balance as well with the 12-100mm? Or should I have upgraded the Pentax and got the benefits of a larger sensor? My attached photo (taken with a Lumix LX100 'snapshot' camera) shows the relative sizes of Samsung NX11, EM5, K5 and EM-1ii. Thanks for reading this.