Canon RF 28-70mm f/2L USM

Pros

• Exceptional sharpness and 'prime-like' image quality across the zoom range.
• Constant f/2 aperture allows for superior low-light performance and shallow depth of field compared to standard f/2.8 zooms.
• Fast and reliable autofocus performance suitable for sports and events.
• Versatile enough to replace several prime lenses (e.g., 35mm, 50mm) in a professional kit.

Cons

• Extremely heavy and bulky, often requiring significant physical effort or 'core strength' to use for extended periods.
• Lacks internal optical Image Stabilization (IS), which can be a drawback on camera bodies without IBIS.
• Starts at 28mm rather than the more common 24mm, sacrificing some wide-angle coverage.
• Very high price point and large filter thread size (95mm).

Caveats

• The physical weight is a frequent point of contention; some users suggest it may lead to physical strain or require a physical therapist after heavy use.
• Some reports of chromatic aberration and slight softness at 70mm when shot wide open at f/2.
• The newer RF 28-70mm f/2.8 is often cited as a more compact and practical alternative for those who don't strictly need the f/2 aperture.

Best for

• Professional wedding and event photographers.
• Indoor sports like basketball or wrestling.
• High-end portraiture where zoom flexibility is needed without sacrificing bokeh.

Avoid if

• You prioritize a lightweight setup for hiking or travel.
• You require a 24mm wide-angle focal length for landscapes or tight spaces.
• You have existing back, wrist, or shoulder issues that make heavy gear difficult to manage.