For the sake of comparison with the 7th-level avowed (a comparison level unfavorable for an avowed, who is just one level away from an iterative attack), here is the most offense-oriented 7th-level fighter I can write up.
Level: 7th
Race: Human
Class: Fighter (free Combat Stamina, mutation warrior)
Key Ability Score: Strength 27 = base 18 + racial 2 + level advancement 1 + enhancement 2 + mutagen 4
Equipment: Gloves of dueling (15,000 gp), belt of giant strength +2 (4,000 gp), +1 falcata (2,318 gp), cracked opalescent pyramid ioun stone (falcata), 682 gp remaining, not even enough for full plate
Key Traits:
Combat: Reactionary
Feats:
Free: Combat Stamina
Human: Power Attack
1st-level: Cleave
Fighter 1: Cleaving Finish
Fighter 2: Focused Discipline
3rd-level: Weapon Focus (falcata)
Fighter 4: Weapon Specialization (falcata)
5th-level: Improved Initiative
Fighter 6: Lunge
7th-level: Furious Focus
Initiative:
1 Dexterity modifier
+2 Reactionary
+4 Improved Initiative
Total: +7
Falcata Attack Bonus:
7 BAB
+8 Strength modifier
+3 weapon training with gloves of dueling
+1 Weapon Focus
+2 Focused Discipline stamina trick
-2 Power Attack
Total: +19
Falcata Damage:
1d8 falcata
+12 Strength modifier multiplied
+3 weapon training with gloves of dueling
+2 Weapon Specialization
+2 Focused Discipline stamina trick
+6 Power Attack
Total: 1d8+25 (average 29.5)
docs.google.com/spreadsheets/d/1E2-s8weiulPoBQjdI05LBzOUToyoZIdSsLKxHAvf8F8/edit#gid=3
paizo.com/pathfinderRPG/prd/bestiary/monsterCreation.html
DPR against CR 8 with average AC 21:
((0.95 * 29.5) + (0.1 * 2 * 0.95 * 29.5)) + ((0.7 * 29.5) + (0.1 * 2 * 0.7 * 29.5)) = 58.41, only ~60.84% of a CR 8 with 96 hit points
The fighter cannot manage the avowed's CR 8-slaying, and has far less noncombat utility and durability to boot. The fighter's only saving grace is Cleaving Finish.
This is particularly damning when, again, the avowed is just a level short of receiving their iterative attack.