nehemiahphoto Offline Upload & Sell: On
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I went through this exact same scenario recently. I purchased my GM24 at launch, and have been using it since. I acquired a Q2 over the summer, updating my post above. I have shot the GM 24 on an a7r2 and a7r3 for years, and more recently an a7c.
Optically, they have different strengths and weaknesses.
The GM wins on:
- MFD performer and bokeh at MFD (aside from 1.4 vs 1.7 but the Q Lux make you stop down to f2.8 on top of not being 1.4)
- The GM has the smoother rendering (if you prefer that), both structurally and with a little SA.
- The GM is wider, faster and cheaper. Especially as you can pick up a used copy mint for under $900.
- The array of AF options, espcially EyeAF is such a boon for environmental portraits, band photography and pets as well.
The Q28 Lux wins on:
- Flare resistance
- LoCal correction (really impressive)
- To me, more pleasant colors and contrast, though a bit higher bite. Might not be preferred for all types of shooting.
- MF experience is far better
- Size and haptics
So, optics alone, no clear winner. I actually prefer the slight amount of structure in the draw for the Q--it's not busy, but does give the lens some personality. I also found Q files generally nicer to work with unless really pushing the Q2 sensor in low light or DR-wise. The Q2 offers better colors and contrast generally--the lens simply has a very elegant way of rendering, especially in black and white. The 24 GM's tonal palate is good but not great like some modern Zeiss or Leica's to me.
In practice, even if you put the GM 24 on an a7c (or now a7cII or a7cR), it's unwelcomingly bulkier (I think), while also being significantly less pleasant to use (ergo, menus and EVF on the A7c cameras are worse, especially the original A7). Both lenses are extremely sharp, but I think the nod probably goes to the Q Lux. Sharpness is not really an issue with either lens when cropping somewhat heavily, at least in the 42-47 MP range.
The GM doesn't have to be married to spendy body though. And the AF is just simply much better for certain AF-intensive tasks with Sony than what the Q2 or Q3 offers. Also, the Q2 capped the SS at 6 seconds, which was horrible for astro purposes. The GM 24 is a champ for astro.
I really enjoy both the GM 24 and Q Lux. Having sold my Q2, I miss it despite having an a7r3 and a7c with a GM 24. The files and shooting experiences were really something. Having said that, if I kept my Q2 and sold my GM 24, I would miss that too.
So, essentially, similar lenses and with well corrected draws, but different enough that you'll feel it. I'd pick up whichever lens your shooting and aesthetic preferences lean towards, while knowing both can do pretty much everything well.
And I still like the RX1 Sonnar the best. Sigh.

GM 24

Q2

Q2

GM 24
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