I am still on my G2, I love the screen to body ratio and small form factor. I have not traded up partly due to those two things, and partly because it can still hold it's own speed wise (for the most part, although with the new snapdragon 820 and 4gb ram that is most likely not the case anymore). However, it is starting to show its age and the non removable battery is not lasting anywhere near as good as it used to. I switched to the G2 from a Galaxy S2, and I prefer LG software vs Touchwiz.
I have really been looking forward to the G5 and really thought this would be my next phone, however, after watching both the G5 and S7 launches, I think I am leaning towards the S7. The waterproof ip68 sounds really nice (thinking about out in the rain, water slide park with the kids, etc) and from a design perspective, the S7 has a much more refined look. I must admit that the release version of the G5 is much better looking than some of the leaked pictures showed, however, it does not look anywhere near as nice as the S7 (in my opinion).
The biggest let down for me is the screen to body ratio and bezels. Even though the bottom bezel appears small at first glance, when you see the screen on, you realize that there is also a black portion of the bezel on top of the detachable part that really stands out and resembles an HTC (not knocking HTC, I have really liked everything other than their bezels on their phones) phone type bezel to go along with the large top bezel. Also, the side edges of the screen don't appear to get as close to the edge as the G2 or the S7 (non edge). I did not upgrade to the G3 or 4 due to the larger size (length and width, I think the width bothers me more) in comparison to the G2, the S7 wins here as well. Even though the S7 (non edge) is only 5.1 I think it will feel at least the same or maybe slightly larger than the G2's 5.2 because the navigation buttons are below and not actually taking up screen real estate. Although the S7 screen to body ratio is also not as good as the G2, it is slightly better. I wish they would upgrade the G2, keeping the dimensions, but upgrading the specs! The smaller battery, 2800 on the G5, is also not as good as the S7 and G2's 3000, sigh...
I am going to reserve my final decision for when I see the full software review. From the initial look, it seems that touchwiz is much improved and LG may have taken one step forward and two steps back so to speak. When the full reviews come out I will know for sure. I appreciate LG's innovative thinking, but I really think they missed the mark on this one for me. Seems they spent too much time and energy on what I see as gimmicky attachments (I know some may disagree, this again is just my opinion) and not enough on upgrading the software experience and refining the design.
The G5 is a good start, but it looks like it needs another iteration to really shine.