You see my lens line up in the link in my signature
To pick a favourite lens is really difficult. There are too many LMount lenses that I like. There is almost none that I do not like.
The most impressive lens in 2024 was for me the (Panasonic?)/Leica Apo 43/2.0 lens in the Leica Q3 43. Sharp like hell, but not clinical sharp. Very nice rendering.
Then there is the Sigma 85/1.4 DG DN Art. Very impressive. But it has a very high competition with the Sigma 90/2.8 DG DN, which might be in some circumstances better for portraits. Not so bitingly sharp as the 85/1.4. But this might be also because of the F1.4 vs. F2.8.
The Sigma 35/1.4 DG DN Art is on a similar level. I do not use it that often, because I prefer the 28mm and 43mm focal length.
From the perspective of optical image quality I also like a lot the Sigma 50/2.0 DG DN. But I prefer 43mm vs. 50mm, so I am more biased towards the Leica Q3 43. If I would like the 50mm FL more, I would like to test the new Sigma 50/1.2 DG DN. I could imagine that this is on par with the Leica Q3 43 lens. Especially the rendering.
But favourite does not mean by default best optical image quality only.
It is also convenience with very good or good enough image quality. The Sigma 28-70/2.8 stands out for me in this category. Very, very good image quality, small & light. Perfect, if you only want to take one lens with you.
The Sigma 65/2.0 DG DN is an impressive lens optically, but we do not become friends. I just do not like to take it with me. The size/weight factor turns me off. I can not explain why. I like even bigger lenses more (i.e. the 85/1.4). Really strange.
Oh boy, there are so many great LMount lenses which I like/love, I have to stop here. But except for the Lumix 70-300 telezoom, all are from Sigma. Especially Sigma i series lenses.
Addendum: All lenses used on a 24 MP sensor, except for the Leica Q3 43.
